diff --git a/packages/devextreme/js/__internal/common/core/animation/frame.ts b/packages/devextreme/js/__internal/common/core/animation/frame.ts
index e3c7f7023bb2..2ab76ff12122 100644
--- a/packages/devextreme/js/__internal/common/core/animation/frame.ts
+++ b/packages/devextreme/js/__internal/common/core/animation/frame.ts
@@ -17,11 +17,13 @@ const window: ExtendedWindow = (hasWindow() ? getWindow() : {}) as ExtendedWindo
 
 const FRAME_ANIMATION_STEP_TIME = 1000 / 60;
 
+// eslint-disable-next-line func-names -- description seam for tests
 let request = function (callback: FrameRequestCallback): number {
   /* eslint-disable no-restricted-globals */
   return setTimeout(callback, FRAME_ANIMATION_STEP_TIME);
 };
 
+// eslint-disable-next-line func-names -- description seam for tests
 let cancel = function (requestID: number): void {
   clearTimeout(requestID);
 };
@@ -45,15 +47,37 @@ const setAnimationFrameMethods = callOnce(() => {
   }
 });
 
-// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
-export function requestAnimationFrame(...args): number {
+/* eslint-disable-next-line
+  @typescript-eslint/explicit-module-boundary-types, import/no-mutable-exports
+  -- description seam for tests */
+export let requestAnimationFrame = function (...args): number {
   setAnimationFrameMethods();
 
   // @ts-ignore
   return request.apply(window, args);
-}
+};
 
-export function cancelAnimationFrame(requestID: number): void {
+/* eslint-disable-next-line
+  import/no-mutable-exports
+  -- description seam for tests */
+export let cancelAnimationFrame = function (requestID: number): void {
   setAnimationFrameMethods();
   cancel.apply(window, [requestID]);
+};
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_requestAnimationFrame(
+  value: typeof requestAnimationFrame,
+): void {
+  requestAnimationFrame = value;
+}
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_cancelAnimationFrame(
+  value: typeof cancelAnimationFrame,
+): void {
+  cancelAnimationFrame = value;
 }
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/common/core/animation/translator.ts b/packages/devextreme/js/__internal/common/core/animation/translator.ts
index 001375a94dc6..306152f9b687 100644
--- a/packages/devextreme/js/__internal/common/core/animation/translator.ts
+++ b/packages/devextreme/js/__internal/common/core/animation/translator.ts
@@ -124,7 +124,8 @@ export const move = function (
   }
 };
 
-export const resetPosition = function (
+/* eslint-disable import/no-mutable-exports -- description seam for tests */
+export let resetPosition = function (
   $element: dxElementWrapper | Element | undefined,
   finishTransition?: boolean,
 ): void {
@@ -170,3 +171,11 @@ export const parseTranslate = function (translateString: string): TranslateVecto
     z: parseFloat(result[2]),
   };
 };
+
+/// #DEBUG
+/* eslint-disable @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_resetPosition(value: typeof resetPosition): void {
+  resetPosition = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/core/localization/ldml/date.parser.ts b/packages/devextreme/js/__internal/core/localization/ldml/date.parser.ts
index 941d4ee6970e..43752f07fbba 100644
--- a/packages/devextreme/js/__internal/core/localization/ldml/date.parser.ts
+++ b/packages/devextreme/js/__internal/core/localization/ldml/date.parser.ts
@@ -235,7 +235,8 @@ export const isPossibleForParsingFormat = (patterns: string[]): boolean => {
   });
 };
 
-export const getRegExpInfo = (
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let getRegExpInfo = (
   format: string,
   dateParts: LdlmDateLocalization,
 ): {
@@ -381,3 +382,11 @@ export const getParser = (format: string, dateParts: LdlmDateLocalization) => {
     return null;
   };
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_getRegExpInfo(value: typeof getRegExpInfo): void {
+  getRegExpInfo = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/axes/base_axis.ts b/packages/devextreme/js/__internal/viz/axes/base_axis.ts
index 66b8919a6f1d..8811d932f81b 100644
--- a/packages/devextreme/js/__internal/viz/axes/base_axis.ts
+++ b/packages/devextreme/js/__internal/viz/axes/base_axis.ts
@@ -313,7 +313,8 @@ function getConstantLineSharpDirection(coord, axisCanvas) {
   return Math.max(axisCanvas.start, axisCanvas.end) !== coord ? 1 : -1;
 }
 
-export const Axis = function (renderSettings) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Axis = function (renderSettings) {
   const that = this;
 
   that._renderer = renderSettings.renderer;
@@ -2839,3 +2840,9 @@ Axis.prototype = {
   shift: _noop,
   /// #ENDDEBUG
 };
+
+/// #DEBUG
+export function DEBUG_set_Axis(value: typeof Axis): void {
+  Axis = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/axes/tick_generator.ts b/packages/devextreme/js/__internal/viz/axes/tick_generator.ts
index 09d459922448..7cba1e2fee6f 100644
--- a/packages/devextreme/js/__internal/viz/axes/tick_generator.ts
+++ b/packages/devextreme/js/__internal/viz/axes/tick_generator.ts
@@ -806,7 +806,8 @@ function dateGenerator(options) {
   );
 }
 
-export const tickGenerator = function (options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let tickGenerator = function (options) {
   let result;
 
   if (options.rangeIsEmpty) {
@@ -823,3 +824,11 @@ export const tickGenerator = function (options) {
 
   return result;
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_tickGenerator(value: typeof tickGenerator): void {
+  tickGenerator = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/chart_components/crosshair.ts b/packages/devextreme/js/__internal/viz/chart_components/crosshair.ts
index 61174b64b40d..f6bac1473ba0 100644
--- a/packages/devextreme/js/__internal/viz/chart_components/crosshair.ts
+++ b/packages/devextreme/js/__internal/viz/chart_components/crosshair.ts
@@ -69,13 +69,14 @@ function getLabelCheckerPosition(x, y, isHorizontal, canvas) {
   };
 }
 
-export function Crosshair(renderer, options, params, group) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Crosshair = function (renderer, options, params, group) {
   const that = this;
   that._renderer = renderer;
   that._crosshairGroup = group;
   that._options = {};
   that.update(options, params);
-}
+};
 
 Crosshair.prototype = {
   constructor: Crosshair,
@@ -323,3 +324,11 @@ Crosshair.prototype = {
     }
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_Crosshair(value: typeof Crosshair): void {
+  Crosshair = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/chart_components/layout_manager.ts b/packages/devextreme/js/__internal/viz/chart_components/layout_manager.ts
index f74d419697b7..69500d196043 100644
--- a/packages/devextreme/js/__internal/viz/chart_components/layout_manager.ts
+++ b/packages/devextreme/js/__internal/viz/chart_components/layout_manager.ts
@@ -122,8 +122,9 @@ function getInnerRadius({ type, innerRadius }) {
   return type === 'pie' ? 0 : _isNumber(innerRadius) ? Number(innerRadius) : DEFAULT_INNER_RADIUS;
 }
 
-function LayoutManager() {
-}
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+let LayoutManager = function () {
+};
 
 function getAverageLabelWidth(centerX, radius, canvas, sizeLabels) {
   return (centerX - radius - RADIAL_LABEL_INDENT - canvas.left) / sizeLabels.outerLabelsCount;
@@ -278,3 +279,9 @@ LayoutManager.prototype = {
 };
 
 export { LayoutManager };
+
+/// #DEBUG
+export function DEBUG_set_LayoutManager(value: typeof LayoutManager): void {
+  LayoutManager = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/chart_components/scroll_bar.ts b/packages/devextreme/js/__internal/viz/chart_components/scroll_bar.ts
index 449be66e01ea..4d744fc09aaf 100644
--- a/packages/devextreme/js/__internal/viz/chart_components/scroll_bar.ts
+++ b/packages/devextreme/js/__internal/viz/chart_components/scroll_bar.ts
@@ -23,7 +23,8 @@ const _min = Math.min;
 const _max = Math.max;
 const MIN_SCROLL_BAR_SIZE = 10;
 
-export const ScrollBar = function (renderer, group) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let ScrollBar = function (renderer, group) {
   this._translator = new Translator2D({}, {}, {});
   this._scroll = renderer.rect().append(group);
   this._addEvents();
@@ -283,3 +284,9 @@ ScrollBar.prototype = {
     });
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_ScrollBar(value: typeof ScrollBar): void {
+  ScrollBar = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/components/chart_theme_manager.ts b/packages/devextreme/js/__internal/viz/components/chart_theme_manager.ts
index 214be1c8e5fe..2c2434452d85 100644
--- a/packages/devextreme/js/__internal/viz/components/chart_theme_manager.ts
+++ b/packages/devextreme/js/__internal/viz/components/chart_theme_manager.ts
@@ -26,7 +26,8 @@ import {
 import { BaseThemeManager } from '@ts/viz/core/base_theme_manager';
 import { extractColor, normalizeEnum as _normalizeEnum } from '@ts/viz/core/utils';
 
-export const ThemeManager = BaseThemeManager.inherit((function () {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let ThemeManager = BaseThemeManager.inherit((function () {
   const ctor = function (params) {
     const that = this;
 
@@ -245,3 +246,11 @@ export const ThemeManager = BaseThemeManager.inherit((function () {
     },
   };
 })());
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_ThemeManager(value: typeof ThemeManager): void {
+  ThemeManager = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/components/data_validator.ts b/packages/devextreme/js/__internal/viz/components/data_validator.ts
index ce855b2f2e60..df90aae1b489 100644
--- a/packages/devextreme/js/__internal/viz/components/data_validator.ts
+++ b/packages/devextreme/js/__internal/viz/components/data_validator.ts
@@ -505,7 +505,8 @@ function verifyData(source, incidentOccurred) {
   return data;
 }
 
-export function validateData(data, groupsData, incidentOccurred, options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let validateData = function (data, groupsData, incidentOccurred, options) {
   data = verifyData(data, incidentOccurred);
 
   groupsData.argumentType = groupsData.argumentAxisType = null;
@@ -524,4 +525,10 @@ export function validateData(data, groupsData, incidentOccurred, options) {
   const dataByArgumentFields = sortData(data, groupsData, options, getUniqueArgumentFields(groupsData));
 
   return dataByArgumentFields;
+};
+
+/// #DEBUG
+export function DEBUG_set_validateData(value: typeof validateData): void {
+  validateData = value;
 }
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/core/base_theme_manager.ts b/packages/devextreme/js/__internal/viz/core/base_theme_manager.ts
index f6b3c66ed460..c380f0b72eef 100644
--- a/packages/devextreme/js/__internal/viz/core/base_theme_manager.ts
+++ b/packages/devextreme/js/__internal/viz/core/base_theme_manager.ts
@@ -32,7 +32,8 @@ function getThemePart(theme, path) {
   return _theme;
 }
 
-export const BaseThemeManager = Class.inherit({ // TODO: test hack
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let BaseThemeManager = Class.inherit({ // TODO: test hack
   ctor(options) {
     this._themeSection = options.themeSection;
     this._fontFields = options.fontFields || [];
@@ -115,3 +116,9 @@ export const BaseThemeManager = Class.inherit({ // TODO: test hack
     _extend(font, this._font, _extend({}, font));
   },
 });
+
+/// #DEBUG
+export function DEBUG_set_BaseThemeManager(value: typeof BaseThemeManager): void {
+  BaseThemeManager = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/core/plaque.ts b/packages/devextreme/js/__internal/viz/core/plaque.ts
index 33f3c017989e..bb4c67808f04 100644
--- a/packages/devextreme/js/__internal/viz/core/plaque.ts
+++ b/packages/devextreme/js/__internal/viz/core/plaque.ts
@@ -223,7 +223,8 @@ function getCloudPoints({ width, height }, x, y, anchorX, anchorY, { arrowWidth,
   return buildPath('M', points, 'Z');
 }
 
-export class Plaque {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Plaque = class {
   widget;
 
   options;
@@ -480,4 +481,10 @@ export class Plaque {
     const { width, height } = this._size || {};
     return Math.abs(x - this.x) <= width / 2 && Math.abs(y - this.y) <= height / 2;
   }
+};
+
+/// #DEBUG
+export function DEBUG_set_Plaque(value: typeof Plaque): void {
+  Plaque = value;
 }
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/core/renderers/animation.ts b/packages/devextreme/js/__internal/viz/core/renderers/animation.ts
index eadbcee48f76..ece2b3283446 100644
--- a/packages/devextreme/js/__internal/viz/core/renderers/animation.ts
+++ b/packages/devextreme/js/__internal/viz/core/renderers/animation.ts
@@ -144,13 +144,14 @@ Animation.prototype = {
   },
 };
 
-export function AnimationController(element) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let AnimationController = function (element) {
   const that = this;
   that._animationCount = 0;
   that._timerId = null;
   that._animations = {};
   that.element = element;
-}
+};
 
 AnimationController.prototype = {
   _loop() {
@@ -239,3 +240,11 @@ AnimationController.prototype = {
     !hasUnstoppableInAnimations && this.stop();
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_AnimationController(value: typeof AnimationController): void {
+  AnimationController = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/core/renderers/renderer.ts b/packages/devextreme/js/__internal/viz/core/renderers/renderer.ts
index 1f911e926157..9dd0b3b6d9ed 100644
--- a/packages/devextreme/js/__internal/viz/core/renderers/renderer.ts
+++ b/packages/devextreme/js/__internal/viz/core/renderers/renderer.ts
@@ -1843,7 +1843,7 @@ function unlinkItem(target) {
   updateIndexes(items, i);
 }
 
-export function Renderer(options) {
+export let Renderer = function (options) {
   const that = this;
   that.root = that._createElement('svg', {
     xmlns: 'http://www.w3.org/2000/svg',
@@ -1868,7 +1868,7 @@ export function Renderer(options) {
   that.root.append({ element: options.container });
   that._locker = 0;
   that._backed = false;
-}
+};
 
 Renderer.prototype = {
   constructor: Renderer,
@@ -2362,10 +2362,15 @@ const DEBUG_set_ArcSvgElement = function (value) {
 const DEBUG_set_TextSvgElement = function (value) {
   TextSvgElement = value;
 };
+
+const DEBUG_set_Renderer = function (value) {
+  Renderer = value;
+};
 /// #ENDDEBUG
 
 /// #DEBUG
 exports.DEBUG_set_ArcSvgElement = DEBUG_set_ArcSvgElement;
+exports.DEBUG_set_Renderer = DEBUG_set_Renderer;
 exports.DEBUG_set_PathSvgElement = DEBUG_set_PathSvgElement;
 exports.DEBUG_set_RectSvgElement = DEBUG_set_RectSvgElement;
 exports.DEBUG_set_SvgElement = DEBUG_set_SvgElement;
diff --git a/packages/devextreme/js/__internal/viz/core/series_family.ts b/packages/devextreme/js/__internal/viz/core/series_family.ts
index 25ca9ce1c54c..727ac86c658b 100644
--- a/packages/devextreme/js/__internal/viz/core/series_family.ts
+++ b/packages/devextreme/js/__internal/viz/core/series_family.ts
@@ -458,7 +458,8 @@ function adjustBubbleSeriesDimensions() {
   });
 }
 
-export function SeriesFamily(options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let SeriesFamily = function (options) {
   /// #DEBUG
   debug.assert(options.type, 'type was not passed or empty');
   /// #ENDDEBUG
@@ -519,7 +520,7 @@ export function SeriesFamily(options) {
       that.adjustSeriesDimensions = adjustBubbleSeriesDimensions;
       break;
   }
-}
+};
 
 SeriesFamily.prototype = {
   constructor: SeriesFamily,
@@ -543,3 +544,9 @@ SeriesFamily.prototype = {
     this.series = _map(series, (singleSeries) => (singleSeries.type === type ? singleSeries : null));
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_SeriesFamily(value: typeof SeriesFamily): void {
+  SeriesFamily = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/core/utils.ts b/packages/devextreme/js/__internal/viz/core/utils.ts
index fde5ddc1087e..4c65756fbeb6 100644
--- a/packages/devextreme/js/__internal/viz/core/utils.ts
+++ b/packages/devextreme/js/__internal/viz/core/utils.ts
@@ -91,7 +91,8 @@ export const degreesToRadians = function (value) {
 
 //  Calculates sin and cos for <angle> in degrees
 //  Expects number, no validation
-export const getCosAndSin = function (angle) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let getCosAndSin = function (angle) {
   const angleInRadians = degreesToRadians(angle);
   return { cos: _cos(angleInRadians), sin: _sin(angleInRadians) };
 };
@@ -276,7 +277,8 @@ export const enumParser = function (values) {
   };
 };
 
-export const patchFontOptions = function (options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let patchFontOptions = function (options) {
   const fontOptions = {};
   each(options || {}, (key, value) => {
     if (/^(cursor)$/i.test(key)) {
@@ -422,7 +424,8 @@ export function normalizePanesHeight(panes) {
   }
 }
 
-export function updatePanesCanvases(panes, canvas, rotated) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let updatePanesCanvases = function (panes, canvas, rotated) {
   let distributedSpace = 0;
   const padding = PANE_PADDING;
   const paneSpace = rotated ? canvas.width - canvas.left - canvas.right : canvas.height - canvas.top - canvas.bottom;
@@ -441,7 +444,7 @@ export function updatePanesCanvases(panes, canvas, rotated) {
     distributedSpace = distributedSpace + calcLength + padding;
     setCanvasValues(pane.canvas);
   });
-}
+};
 
 export const unique = function (array) {
   const values = {};
@@ -671,7 +674,8 @@ export function pointInCanvas(canvas, x, y) {
   return x >= canvas.left && x <= canvas.right && y >= canvas.top && y <= canvas.bottom;
 }
 
-export const getNextDefsSvgId = () => `DevExpress_${numDefsSvgElements++}`;
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let getNextDefsSvgId = () => `DevExpress_${numDefsSvgElements++}`;
 
 export function extractColor(color, isBase?) {
   if (isString(color) || !color) {
@@ -681,3 +685,21 @@ export function extractColor(color, isBase?) {
   }
   return color.fillId || color.base;
 }
+
+/// #DEBUG
+export function DEBUG_set_getCosAndSin(value: typeof getCosAndSin): void {
+  getCosAndSin = value;
+}
+
+export function DEBUG_set_patchFontOptions(value: typeof patchFontOptions): void {
+  patchFontOptions = value;
+}
+
+export function DEBUG_set_updatePanesCanvases(value: typeof updatePanesCanvases): void {
+  updatePanesCanvases = value;
+}
+
+export function DEBUG_set_getNextDefsSvgId(value: typeof getNextDefsSvgId): void {
+  getNextDefsSvgId = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/palette.ts b/packages/devextreme/js/__internal/viz/palette.ts
index 6f857efb3b05..8d00c26d2486 100644
--- a/packages/devextreme/js/__internal/viz/palette.ts
+++ b/packages/devextreme/js/__internal/viz/palette.ts
@@ -194,10 +194,11 @@ export function registerPalette(name, palette) {
   }
 }
 
-export function getAccentColor(palette, themeDefault) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let getAccentColor = function (palette, themeDefault) {
   palette = getPalette(palette, { themeDefault });
   return palette.accentColor || palette[0];
-}
+};
 
 function RingBuf(buf) {
   let ind = 0;
@@ -430,7 +431,8 @@ function getColorMixer(palette, parameters) {
   };
 }
 
-export function createPalette(palette, parameters, themeDefaultPalette?) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let createPalette = function (palette, parameters, themeDefaultPalette?) {
   const paletteObj = {
     dispose() {
       this._extensionStrategy = null;
@@ -469,7 +471,7 @@ export function createPalette(palette, parameters, themeDefaultPalette?) {
   paletteObj.reset();
 
   return paletteObj;
-}
+};
 
 function getAlteredPalette(originalPalette, step) {
   const palette = [];
@@ -495,7 +497,8 @@ function getLightness(color) {
   return color.r * 0.3 + color.g * 0.59 + color.b * 0.11;
 }
 
-export function getDiscretePalette(source, size, themeDefaultPalette) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let getDiscretePalette = function (source, size, themeDefaultPalette) {
   const palette = size > 0 ? createDiscreteColors(getPalette(source, { type: 'gradientSet', themeDefault: themeDefaultPalette }), size) : [];
 
   return {
@@ -503,7 +506,7 @@ export function getDiscretePalette(source, size, themeDefaultPalette) {
       return palette[index] || null;
     },
   };
-}
+};
 
 function createDiscreteColors(source, count) {
   const colorCount = count - 1;
@@ -550,3 +553,15 @@ export function getGradientPalette(source, themeDefaultPalette) {
 /// #DEBUG
 export const _DEBUG_palettes = palettes;
 /// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_getAccentColor(value: typeof getAccentColor): void {
+  getAccentColor = value;
+}
+export function DEBUG_set_createPalette(value: typeof createPalette): void {
+  createPalette = value;
+}
+export function DEBUG_set_getDiscretePalette(value: typeof getDiscretePalette): void {
+  getDiscretePalette = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/range_selector/range_view.ts b/packages/devextreme/js/__internal/viz/range_selector/range_view.ts
index 3d5424ba3beb..ed73becd129f 100644
--- a/packages/devextreme/js/__internal/viz/range_selector/range_view.ts
+++ b/packages/devextreme/js/__internal/viz/range_selector/range_view.ts
@@ -36,11 +36,12 @@ function merge(a, b) {
   return a !== undefined ? a : b;
 }
 
-export function RangeView(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let RangeView = function (params) {
   this._params = params;
   this._clipRect = params.renderer.clipRect();
   params.root.attr({ 'clip-path': this._clipRect.id });
-}
+};
 
 RangeView.prototype = {
   constructor: RangeView,
@@ -84,3 +85,11 @@ RangeView.prototype = {
     }
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_RangeView(value: typeof RangeView): void {
+  RangeView = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/range_selector/series_data_source.ts b/packages/devextreme/js/__internal/viz/range_selector/series_data_source.ts
index 46a17f76d824..8eaa6ddb6d7d 100644
--- a/packages/devextreme/js/__internal/viz/range_selector/series_data_source.ts
+++ b/packages/devextreme/js/__internal/viz/range_selector/series_data_source.ts
@@ -57,7 +57,8 @@ const processSeriesFamilies = function (series, minBubbleSize, maxBubbleSize, ba
   return families;
 };
 
-export const SeriesDataSource = function (options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let SeriesDataSource = function (options) {
   const that = this;
   const themeManager = that._themeManager = createThemeManager(options.chart);
 
@@ -278,3 +279,11 @@ SeriesDataSource.prototype = {
     return this._themeManager;
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_SeriesDataSource(value: typeof SeriesDataSource): void {
+  SeriesDataSource = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/range_selector/sliders_controller.ts b/packages/devextreme/js/__internal/viz/range_selector/sliders_controller.ts
index f2c26e68e6b8..ae3898626ea9 100644
--- a/packages/devextreme/js/__internal/viz/range_selector/sliders_controller.ts
+++ b/packages/devextreme/js/__internal/viz/range_selector/sliders_controller.ts
@@ -75,7 +75,8 @@ function restoreSetSelectedRange(controller) {
   delete controller.setSelectedRange;
 }
 
-export function SlidersController(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let SlidersController = function (params) {
   const that = this;
   const sliderParams = {
     renderer: params.renderer, root: params.root, trackersGroup: params.trackersGroup, translator: params.translator,
@@ -89,7 +90,7 @@ export function SlidersController(params) {
   // It seems that there is no special reasons to suppress first event - it was accidentally suppressed.
   // Let it stay so for now.
   that._processSelectionChanged = dummyProcessSelectionChanged;
-}
+};
 
 SlidersController.prototype = {
   constructor: SlidersController,
@@ -519,3 +520,11 @@ SlidersController.prototype = {
     this._sliders[index].toForeground();
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_SlidersController(value: typeof SlidersController): void {
+  SlidersController = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/range_selector/tracker.ts b/packages/devextreme/js/__internal/viz/range_selector/tracker.ts
index fcc50b508ad1..ee91d4d4b430 100644
--- a/packages/devextreme/js/__internal/viz/range_selector/tracker.ts
+++ b/packages/devextreme/js/__internal/viz/range_selector/tracker.ts
@@ -222,7 +222,8 @@ function initializeSliderEvents(controller, sliders, state, getRootOffsetLeft) {
   return docEvents;
 }
 
-export function Tracker(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Tracker = function (params) {
   const state = this._state = {};
   const targets = params.controller.getTrackerTargets();
   if (msPointerEnabled) {
@@ -242,7 +243,7 @@ export function Tracker(params) {
   function getRootOffsetLeft() {
     return params.renderer.getRootOffset().left;
   }
-}
+};
 
 Tracker.prototype = {
   constructor: Tracker,
@@ -260,3 +261,11 @@ Tracker.prototype = {
     state.manualRangeSelectionEnabled = behavior.manualRangeSelectionEnabled;
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_Tracker(value: typeof Tracker): void {
+  Tracker = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/series/base_series.ts b/packages/devextreme/js/__internal/viz/series/base_series.ts
index 3c7a86040693..864025498e3d 100644
--- a/packages/devextreme/js/__internal/viz/series/base_series.ts
+++ b/packages/devextreme/js/__internal/viz/series/base_series.ts
@@ -179,7 +179,8 @@ function mergePointOptions(base, extra) {
   return options;
 }
 
-export function Series(settings, options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Series = function (settings, options) {
   const that = this;
   that.fullState = 0;
   that._extGroups = settings;
@@ -191,7 +192,7 @@ export function Series(settings, options) {
 
   that._legendCallback = _noop;
   that.updateOptions(options, settings);
-}
+};
 
 function getData(pointData) {
   return pointData.data;
@@ -1382,3 +1383,11 @@ Series.prototype = {
 };
 // @ts-expect-error
 export const mixins = seriesNS.mixins;
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_Series(value: typeof Series): void {
+  Series = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/series/points/base_point.ts b/packages/devextreme/js/__internal/viz/series/points/base_point.ts
index ccb51c7e0c34..acc91bc39396 100644
--- a/packages/devextreme/js/__internal/viz/series/points/base_point.ts
+++ b/packages/devextreme/js/__internal/viz/series/points/base_point.ts
@@ -89,7 +89,8 @@ function isNoneMode(mode) {
   return _normalizeEnum(mode) === 'none';
 }
 
-export function Point(series, dataItem, options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Point = function (series, dataItem, options) {
   this.fullState = NORMAL_STATE;
   this.series = series;
   this.update(dataItem, options);
@@ -104,7 +105,7 @@ export function Point(series, dataItem, options) {
     dashStyle: null,
     filter: null,
   };
-}
+};
 // @ts-expect-error
 mixins.symbolPoint = symbolPoint;
 // @ts-expect-error
@@ -547,3 +548,9 @@ Point.prototype = {
     };
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_Point(value: typeof Point): void {
+  Point = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/series/points/label.ts b/packages/devextreme/js/__internal/viz/series/points/label.ts
index 1792537c2d71..327f2763845d 100644
--- a/packages/devextreme/js/__internal/viz/series/points/label.ts
+++ b/packages/devextreme/js/__internal/viz/series/points/label.ts
@@ -290,13 +290,14 @@ function formatText(data, options) {
   return options.customizeText ? options.customizeText.call(data, data) : options.displayFormat ? processDisplayFormat(options.displayFormat, data) : data.valueText;
 }
 
-export function Label(renderSettings) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Label = function (renderSettings) {
   this._renderer = renderSettings.renderer;
   this._container = renderSettings.labelsGroup;
   this._point = renderSettings.point;
   this._strategy = renderSettings.strategy;
   this._rowCount = 1;
-}
+};
 
 Label.prototype = {
   constructor: Label,
@@ -551,5 +552,12 @@ Label.prototype = {
 };
 
 /// #DEBUG
-Label._DEBUG_formatText = formatText;
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+(Label as any)._DEBUG_formatText = formatText;
+/// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_Label(value: typeof Label): void {
+  Label = value;
+}
 /// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/translators/range.ts b/packages/devextreme/js/__internal/viz/translators/range.ts
index be556c949927..d4ed7f96c59d 100644
--- a/packages/devextreme/js/__internal/viz/translators/range.ts
+++ b/packages/devextreme/js/__internal/viz/translators/range.ts
@@ -43,7 +43,8 @@ function compareAndReplace(thisValue, otherValue, setValue, compare) {
   }
 }
 
-export const Range = function (range?) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Range = function (range?) {
   range && extend(this, range);
 };
 
@@ -156,3 +157,9 @@ _Range.prototype = {
     }
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_Range(value: typeof Range): void {
+  Range = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/translators/translator1d.ts b/packages/devextreme/js/__internal/viz/translators/translator1d.ts
index f0caa9bd9a9e..3f9d1d7479be 100644
--- a/packages/devextreme/js/__internal/viz/translators/translator1d.ts
+++ b/packages/devextreme/js/__internal/viz/translators/translator1d.ts
@@ -9,9 +9,10 @@
 
 const _Number = Number;
 
-export function Translator1D() {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Translator1D = function () {
   this.setDomain(arguments[0], arguments[1]).setCodomain(arguments[2], arguments[3]).setInverted(false);
-}
+};
 
 Translator1D.prototype = {
   constructor: Translator1D,
@@ -87,3 +88,9 @@ Translator1D.prototype = {
     return result;
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_Translator1D(value: typeof Translator1D): void {
+  Translator1D = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/translators/translator2d.ts b/packages/devextreme/js/__internal/viz/translators/translator2d.ts
index a14d04727579..c354e9a42896 100644
--- a/packages/devextreme/js/__internal/viz/translators/translator2d.ts
+++ b/packages/devextreme/js/__internal/viz/translators/translator2d.ts
@@ -164,7 +164,8 @@ function getCheckingMethodsAboutBreaks(inverted) {
   };
 }
 
-const _Translator2d = function (businessRange, canvas, options) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+let _Translator2d = function (businessRange, canvas, options) {
   this.update(businessRange, canvas, options);
 };
 
@@ -722,3 +723,9 @@ _Translator2d.prototype = {
 };
 
 export { _Translator2d as Translator2D };
+
+/// #DEBUG
+export function DEBUG_set_Translator2D(value: typeof _Translator2d): void {
+  _Translator2d = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/control_bar/control_bar.ts b/packages/devextreme/js/__internal/viz/vector_map/control_bar/control_bar.ts
index dff2890bb1ef..5c13173ec984 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/control_bar/control_bar.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/control_bar/control_bar.ts
@@ -73,7 +73,8 @@ COMMAND_TO_TYPE_MAP[COMMAND_MOVE_UP] = COMMAND_TO_TYPE_MAP[COMMAND_MOVE_RIGHT] =
 COMMAND_TO_TYPE_MAP[COMMAND_ZOOM_IN] = COMMAND_TO_TYPE_MAP[COMMAND_ZOOM_OUT] = ZoomCommand;
 COMMAND_TO_TYPE_MAP[COMMAND_ZOOM_DRAG] = ZoomDragCommand;
 
-export function ControlBar(parameters) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let ControlBar = function (parameters) {
   const that = this;
   that._params = parameters;
   that._createElements(parameters.renderer, parameters.container, parameters.dataKey);
@@ -81,7 +82,7 @@ export function ControlBar(parameters) {
   that._subscribeToProjection(parameters.projection);
   that._subscribeToTracker(parameters.tracker);
   that._createCallbacks(parameters.projection);
-}
+};
 
 ControlBar.prototype = {
   constructor: ControlBar,
@@ -472,3 +473,9 @@ exports._TESTS_restoreCommandToTypeMap = function () {
   COMMAND_TO_TYPE_MAP = COMMAND_TO_TYPE_MAP__ORIGINAL;
 };
 /// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_ControlBar(value: typeof ControlBar): void {
+  ControlBar = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/data_exchanger.ts b/packages/devextreme/js/__internal/viz/vector_map/data_exchanger.ts
index 3f0cf7a4f8a6..7078a0d1096f 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/data_exchanger.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/data_exchanger.ts
@@ -6,9 +6,10 @@
 
 import Callbacks from '@js/core/utils/callbacks';
 
-export function DataExchanger() {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let DataExchanger = function () {
   this._store = {};
-}
+};
 
 DataExchanger.prototype = {
   constructor: DataExchanger,
@@ -43,3 +44,11 @@ DataExchanger.prototype = {
     return this;
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_DataExchanger(value: typeof DataExchanger): void {
+  DataExchanger = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/gesture_handler.ts b/packages/devextreme/js/__internal/viz/vector_map/gesture_handler.ts
index 0fffd4195425..5e81a443e38a 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/gesture_handler.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/gesture_handler.ts
@@ -8,13 +8,14 @@
 const _ln = Math.log;
 const _LN2 = Math.LN2;
 
-export function GestureHandler(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let GestureHandler = function (params) {
   const that = this;
   that._projection = params.projection;
   that._renderer = params.renderer;
   that._x = that._y = 0;
   that._subscribeToTracker(params.tracker);
-}
+};
 
 GestureHandler.prototype = {
   constructor: GestureHandler,
@@ -106,3 +107,9 @@ GestureHandler.prototype = {
     }
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_GestureHandler(value: typeof GestureHandler): void {
+  GestureHandler = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/layout.ts b/packages/devextreme/js/__internal/viz/vector_map/layout.ts
index 8de01f8433b4..f440424f6c94 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/layout.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/layout.ts
@@ -207,7 +207,8 @@ function applyLayout(canvas, items) {
   }
 }
 
-export function LayoutControl(widget) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let LayoutControl = function (widget) {
   const that = this;
   that._items = [];
   that._suspended = 0;
@@ -215,7 +216,7 @@ export function LayoutControl(widget) {
   that._updateLayout = function () {
     that._update();
   };
-}
+};
 
 LayoutControl.prototype = {
   constructor: LayoutControl,
@@ -266,3 +267,9 @@ LayoutControl.prototype = {
     }
   },
 };
+
+/// #DEBUG
+export function DEBUG_set_LayoutControl(value: typeof LayoutControl): void {
+  LayoutControl = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/legend.ts b/packages/devextreme/js/__internal/viz/vector_map/legend.ts
index eb5d39c0c227..a0cc3472d8da 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/legend.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/legend.ts
@@ -119,11 +119,11 @@ Legend.prototype = _extend(clone(_BaseLegend.prototype), {
   },
 });
 
-export function LegendsControl(parameters) {
+export let LegendsControl = function (parameters) {
   this._params = parameters;
   this._items = [];
   parameters.container.virtualLink('legend-base');
-}
+};
 
 LegendsControl.prototype = {
   constructor: LegendsControl,
@@ -170,3 +170,9 @@ exports._TESTS_restoreLegendType = function () {
   Legend = originalLegend;
 };
 /// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_LegendsControl(value: typeof LegendsControl): void {
+  LegendsControl = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/map_layer.ts b/packages/devextreme/js/__internal/viz/vector_map/map_layer.ts
index fadc174a8208..cb2bbc518577 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/map_layer.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/map_layer.ts
@@ -1596,7 +1596,8 @@ function projectLineLabel(coordinates) {
   return resultData || [[], []];
 }
 
-export function MapLayerCollection(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let MapLayerCollection = function (params) {
   const that = this;
   const renderer = params.renderer;
   that._params = params;
@@ -1609,7 +1610,7 @@ export function MapLayerCollection(params) {
   that._container = renderer.g().attr({ class: 'dxm-layers', 'clip-path': that._clip.id }).append(renderer.root).enableLinks();
   that._subscribeToTracker(params.tracker, renderer, params.eventTrigger);
   that._dataReady = params.dataReady;
-}
+};
 
 MapLayerCollection.prototype = {
   constructor: MapLayerCollection,
@@ -1745,3 +1746,9 @@ export const _TESTS_stub_groupBySize = function (stub) {
 export const _TESTS_groupBySize = groupBySize;
 export const _TESTS_findGroupingIndex = findGroupingIndex;
 /// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_MapLayerCollection(value: typeof MapLayerCollection): void {
+  MapLayerCollection = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/projection.main.ts b/packages/devextreme/js/__internal/viz/vector_map/projection.main.ts
index 3a960f5aaac9..953b23ccb8ee 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/projection.main.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/projection.main.ts
@@ -65,7 +65,8 @@ function getEngine(engine) {
   return (engine instanceof Engine && engine) || projection.get(engine) || projection(engine) || projection.get(DEFAULT_ENGINE_NAME);
 }
 
-export const Projection = function (parameters) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let Projection = function (parameters) {
   const that = this;
   that._initEvents();
   that._params = parameters;
@@ -553,3 +554,9 @@ function createProjectUnprojectMethods(project, unproject, p1, p2, delta) {
 /// #DEBUG
 export { Engine as _TESTS_Engine };
 /// #ENDDEBUG
+
+/// #DEBUG
+export function DEBUG_set_Projection(value: typeof Projection): void {
+  Projection = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/tooltip_viewer.ts b/packages/devextreme/js/__internal/viz/vector_map/tooltip_viewer.ts
index 5e51270096a5..74be4028610a 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/tooltip_viewer.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/tooltip_viewer.ts
@@ -9,9 +9,10 @@
 const TOOLTIP_OFFSET = 12;
 
 // TODO: Somehow it should be merged with the core.Tooltip
-export function TooltipViewer(params) {
+// eslint-disable-next-line import/no-mutable-exports -- description seam for tests
+export let TooltipViewer = function (params) {
   this._subscribeToTracker(params.tracker, params.tooltip, params.layerCollection);
-}
+};
 
 TooltipViewer.prototype = {
   constructor: TooltipViewer,
@@ -45,3 +46,11 @@ TooltipViewer.prototype = {
     });
   },
 };
+
+/// #DEBUG
+/* eslint-disable-next-line @typescript-eslint/naming-convention
+  -- description seam setter for tests stubs */
+export function DEBUG_set_TooltipViewer(value: typeof TooltipViewer): void {
+  TooltipViewer = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/__internal/viz/vector_map/tracker.ts b/packages/devextreme/js/__internal/viz/vector_map/tracker.ts
index 55be5e250222..afbf4e5e91ad 100644
--- a/packages/devextreme/js/__internal/viz/vector_map/tracker.ts
+++ b/packages/devextreme/js/__internal/viz/vector_map/tracker.ts
@@ -57,7 +57,7 @@ let Focus;
 
 setupEvents();
 
-export function Tracker(parameters) {
+export let Tracker = function (parameters) {
   const that = this;
   that._root = parameters.root;
   that._createEventHandlers(parameters.dataKey);
@@ -67,7 +67,7 @@ export function Tracker(parameters) {
     that._fire(name, arg);
   });
   that._attachHandlers();
-}
+};
 
 Tracker.prototype = {
   constructor: Tracker,
@@ -580,3 +580,9 @@ function adjustWheelDelta(delta, lock) {
   }
   return sign * _delta;
 }
+
+/// #DEBUG
+export function DEBUG_set_Tracker(value: typeof Tracker): void {
+  Tracker = value;
+}
+/// #ENDDEBUG
diff --git a/packages/devextreme/js/common/core/events/visibility_change.js b/packages/devextreme/js/common/core/events/visibility_change.js
index 93ea077c6d9a..e678ff243c28 100644
--- a/packages/devextreme/js/common/core/events/visibility_change.js
+++ b/packages/devextreme/js/common/core/events/visibility_change.js
@@ -1,7 +1,21 @@
 import VisibilityChangeModule from '../../../__internal/events/m_visibility_change';
 
-export const triggerShownEvent = VisibilityChangeModule.triggerShownEvent;
-export const triggerHidingEvent = VisibilityChangeModule.triggerHidingEvent;
-export const triggerResizeEvent = VisibilityChangeModule.triggerResizeEvent;
+export let triggerShownEvent = VisibilityChangeModule.triggerShownEvent;
+export let triggerHidingEvent = VisibilityChangeModule.triggerHidingEvent;
+export let triggerResizeEvent = VisibilityChangeModule.triggerResizeEvent;
+
+/// #DEBUG
+export function DEBUG_set_triggerShownEvent(value) {
+    triggerShownEvent = value;
+}
+
+export function DEBUG_set_triggerHidingEvent(value) {
+    triggerHidingEvent = value;
+}
+
+export function DEBUG_set_triggerResizeEvent(value) {
+    triggerResizeEvent = value;
+}
+/// #ENDDEBUG
 
 export default VisibilityChangeModule;
diff --git a/packages/devextreme/js/exporter.js b/packages/devextreme/js/exporter.js
index cfcf606cc8ee..0cdb267d06a1 100644
--- a/packages/devextreme/js/exporter.js
+++ b/packages/devextreme/js/exporter.js
@@ -1,13 +1,16 @@
 import * as clientExporter from './__internal/exporter/exporter';
 
-// Re-exported through local bindings on purpose: `export { … } from './…'` compiles to
-// getter-only, non-configurable properties, while tests stub these members
-// (see testing/tests/DevExpress.viz.core/export.tests.js).
-const _export = clientExporter.export;
+let _export = clientExporter.export;
 
 export const fileSaver = clientExporter.fileSaver;
 export const image = clientExporter.image;
 export const pdf = clientExporter.pdf;
 export const svg = clientExporter.svg;
 
+/// #DEBUG
+export function DEBUG_set_export(value) {
+    _export = value;
+}
+/// #ENDDEBUG
+
 export { _export as export };
diff --git a/packages/devextreme/testing/helpers/chartMocks.js b/packages/devextreme/testing/helpers/chartMocks.js
index f7acef832d79..6d5945d1c21c 100644
--- a/packages/devextreme/testing/helpers/chartMocks.js
+++ b/packages/devextreme/testing/helpers/chartMocks.js
@@ -16,7 +16,6 @@ import {
 } from './vizMocks.js';
 import { Range } from 'viz/translators/range';
 
-const mutableSeriesFamilyModule = seriesFamilyModule.default ?? seriesFamilyModule;
 
 const LoadingIndicatorOrig = loadingIndicatorModule.LoadingIndicator;
 
@@ -283,16 +282,28 @@ function createAxis(translatorData, orthogonalTranslatorData, allOptions, isHori
     return axis;
 }
 
+// Modules that dropped their generated facade expose a DEBUG_set_* seam; the
+// rest are still plain mutable objects.
+function setItem(itemKey, moduleName, value) {
+    const setter = moduleName['DEBUG_set_' + itemKey];
+
+    if(typeof setter === 'function') {
+        setter(value);
+    } else {
+        moduleName[itemKey] = value;
+    }
+}
+
 function mockItem(itemKey, moduleName, mock) {
     if(sourceItemsToMocking[itemKey]) {
         throw 'Item ' + itemKey + ' already mocked';
     }
     sourceItemsToMocking[itemKey] = moduleName[itemKey];
-    moduleName[itemKey] = mock;
+    setItem(itemKey, moduleName, mock);
 }
 
 function restoreItem(itemKey, moduleName) {
-    moduleName[itemKey] = sourceItemsToMocking[itemKey];
+    setItem(itemKey, moduleName, sourceItemsToMocking[itemKey]);
     sourceItemsToMocking[itemKey] = null;
 }
 
@@ -396,9 +407,9 @@ export const resetMockFactory = function resetMockFactory() {
 };
 
 export const setupSeriesFamily = function() {
-    mutableSeriesFamilyModule.SeriesFamily = function(options) {
+    seriesFamilyModule.DEBUG_set_SeriesFamily(function(options) {
         return new MockSeriesFamily(options);
-    };
+    });
 };
 //  Translator
 
diff --git a/packages/devextreme/testing/helpers/esm-shims/mutable_facade.js b/packages/devextreme/testing/helpers/esm-shims/mutable_facade.js
deleted file mode 100644
index 8cc00339e1b3..000000000000
--- a/packages/devextreme/testing/helpers/esm-shims/mutable_facade.js
+++ /dev/null
@@ -1,50 +0,0 @@
-/**
- * Shared helpers for mutable ESM facades used by QUnit stubbing.
- */
-export function wrapCtor(api, name) {
-    const ExportWrapper = function(...args) {
-        const Impl = api[name];
-        if(new.target) {
-            return new Impl(...args);
-        }
-        return Impl.apply(this, args);
-    };
-    Object.defineProperty(ExportWrapper, 'name', { value: name, configurable: true });
-    // Point at the live implementation prototype so stubClass(import { X })
-    // sees real methods (e.g. vizMocks Tooltip/Title/ExportMenu).
-    // Also inherit statics (Class.inherit / redefine / parent / …) so
-    // `BaseThemeManager.inherit(...)` keeps working under the facade.
-    const Impl = api[name];
-    if(typeof Impl === 'function') {
-        Object.setPrototypeOf(ExportWrapper, Impl);
-        if(Impl.prototype) {
-            ExportWrapper.prototype = Impl.prototype;
-        }
-    }
-    return ExportWrapper;
-}
-
-/**
- * @param {object} original
- * @param {string} globalKey
- * @param {Record<string, string>} [debugSets] map DEBUG_set_* → api property name
- */
-export function createMutableApi(original, globalKey, debugSets = {}) {
-    if(globalThis[globalKey]) {
-        return globalThis[globalKey];
-    }
-
-    const api = { ...original };
-    Object.entries(debugSets).forEach(([debugName, propName]) => {
-        const originalDebugSet = api[debugName];
-        api[debugName] = (value) => {
-            api[propName] = value;
-            if(typeof originalDebugSet === 'function') {
-                originalDebugSet(value);
-            }
-        };
-    });
-
-    globalThis[globalKey] = api;
-    return api;
-}
diff --git a/packages/devextreme/testing/helpers/moduleSeam.js b/packages/devextreme/testing/helpers/moduleSeam.js
new file mode 100644
index 000000000000..0f02d142dab4
--- /dev/null
+++ b/packages/devextreme/testing/helpers/moduleSeam.js
@@ -0,0 +1,18 @@
+/* global sinon */
+
+export function installSeam(module, name, replacement, setterName = `DEBUG_set_${name}`) {
+    const original = module[name];
+
+    replacement.restore = () => module[setterName](original);
+    module[setterName](replacement);
+
+    return replacement;
+}
+
+export function spySeam(module, name, setterName) {
+    return installSeam(module, name, sinon.spy(module[name]), setterName);
+}
+
+export function stubSeam(module, name, setterName) {
+    return installSeam(module, name, sinon.stub(), setterName);
+}
diff --git a/packages/devextreme/testing/helpers/trackerMock.js b/packages/devextreme/testing/helpers/trackerMock.js
index 70c00a82ab46..9b8a6f7e513c 100644
--- a/packages/devextreme/testing/helpers/trackerMock.js
+++ b/packages/devextreme/testing/helpers/trackerMock.js
@@ -1,5 +1,4 @@
 import { stubClass } from './vizMocks.js';
-// Mutate the import-map facade (see esm-shims/viz_chart_tracker.js).
 import trackerModule from 'viz/chart_components/tracker';
 
 const ChartTrackerStub = stubClass(trackerModule.ChartTracker);
diff --git a/packages/devextreme/testing/helpers/visibilityChangeMock.js b/packages/devextreme/testing/helpers/visibilityChangeMock.js
new file mode 100644
index 000000000000..01ff2d64e372
--- /dev/null
+++ b/packages/devextreme/testing/helpers/visibilityChangeMock.js
@@ -0,0 +1,11 @@
+import * as visibilityChange from 'common/core/events/visibility_change';
+
+import { spySeam, stubSeam } from './moduleSeam.js';
+
+export function spyVisibilityEvent(name) {
+    return spySeam(visibilityChange, name);
+}
+
+export function stubVisibilityEvent(name) {
+    return stubSeam(visibilityChange, name);
+}
diff --git a/packages/devextreme/testing/helpers/vizMocks.js b/packages/devextreme/testing/helpers/vizMocks.js
index 9f970a1c93d0..19d5b610f701 100644
--- a/packages/devextreme/testing/helpers/vizMocks.js
+++ b/packages/devextreme/testing/helpers/vizMocks.js
@@ -1,14 +1,14 @@
 /* global currentAssert, currentTest, sinon */
 
 import $ from 'jquery';
-import * as tooltipModule from 'viz/core/tooltip';
-import * as titleModule from 'viz/core/title';
+import tooltipModule from 'viz/core/tooltip';
+import titleModule from 'viz/core/title';
 import legendModule from 'viz/components/legend';
 import axisModule from 'viz/axes/base_axis';
-import * as pointModule from 'viz/series/points/base_point';
+import pointModule from 'viz/series/points/base_point';
 import { Series } from 'viz/series/base_series';
-import * as loadingIndicatorModule from 'viz/core/loading_indicator';
-import * as exportMenuModule from 'viz/core/export';
+import loadingIndicatorModule from 'viz/core/loading_indicator';
+import exportMenuModule from 'viz/core/export';
 import rendererModule from 'viz/core/renderers/renderer_default';
 import errors from 'viz/core/errors_warnings';
 import * as baseWidgetUtils from '__internal/viz/core/base_widget.utils';
diff --git a/packages/devextreme/testing/runner/README.md b/packages/devextreme/testing/runner/README.md
index e35639ae1ce2..b1ea2acfb29c 100644
--- a/packages/devextreme/testing/runner/README.md
+++ b/packages/devextreme/testing/runner/README.md
@@ -25,9 +25,7 @@ HTTP static file server for the QUnit runner.
   - `aspnet.js` UMD artifact → `cjsInterop.rewriteAspnetArtifactToEsm`
   - Vendor / Globalize / Intl / VectorMap bundles → wrap as ESM modules
   - JSON (`?esm-export=1`) → `export default …`
-- Serve **generated** mutable facades for modules in `MUTABLE_MODULE_GROUPS` / viz namespace-reexports; redirect only special hand-written cases (e.g. themes).
-- For pure `import * as X; export default X` viz reexports, generate facades on the fly via `autoMutableFacade.tryBuildAutoMutableFacade`.
-- Support `?dx-original=1` so a shim can import the **real** artifact without being redirected back to itself.
+- Redirect the few artifact URLs that have a hand-written shim (themes) — see `handWrittenShims.ts`.
 
 This module is the integration point: almost every special-case rewrite for QUnit ESM loading goes through `tryServeStatic`.
 
@@ -51,40 +49,54 @@ Serve-time **CJS → ESM** source rewrites for QUnit tests, helpers, and bundle
 
 ---
 
-## `lib/autoMutableFacade.ts`
+## Stubbing a module from a test
 
-Generates **mutable ESM facades** at request time so QUnit can `sinon.stub` module APIs without editing `packages/devextreme/js`.
+Modules are served as plain ESM artifacts. A module namespace object is frozen, so
+`sinon.stub(module, 'name')` and `module.name = fn` both throw — the exporting module
+is the only thing that can reassign its own binding.
 
-**Two sources of facades:**
+The house pattern is a **`DEBUG_set_*` seam**: turn the export into a `let` and add a
+setter inside a `/// #DEBUG` block, which `-c qunit` builds keep and production builds
+strip.
 
-1. **`MUTABLE_MODULE_GROUPS`** ([`mutableModuleGroups.ts`](./lib/mutableModuleGroups.ts)) — explicit list of stub-able modules (animation frame, viz renderer, exporter, …). All aliases share one `globalThis` api; named exports use `wrapCtor` / live forwards. Import map points at the ESM artifact URL; `static.ts` serves the generated facade unless `?dx-original=1`. Codegen lives in `autoMutableFacade.ts`.
-2. **Namespace-default reexports** (`import * as X; export default X`) under `viz/` — discovered automatically.
+```ts
+export let Renderer = function (options) { /* … */ };
+
+/// #DEBUG
+export function DEBUG_set_Renderer(value: typeof Renderer): void {
+  Renderer = value;
+}
+/// #ENDDEBUG
+```
 
-Hand-written files under `esm-shims/` remain only for **non-generic** cases (themes composition, CSS inject, jquery/knockout globals, vendor stubs).
+Product code that does `import { Renderer } from '…'` sees the new value, because ESM
+named exports are live bindings.
 
-Typical generated shape:
+In tests, drive the seam through [`testing/helpers/moduleSeam.js`](../helpers/moduleSeam.js),
+which re-attaches the `.restore()` that an anonymous `sinon.stub()` lacks:
 
 ```js
-import * as original from '.../module.js?dx-original=1';
-import { createMutableApi, wrapCtor } from '.../mutable_facade.js';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
-const api = createMutableApi(original, '__dxAutoMutable_…');
-export const Foo = wrapCtor(api, 'Foo');
-export default api;
+// was: sinon.stub(rendererModule, 'Renderer')
+const stub = stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer');
+// …
+stub.restore();
+
+// was: rendererModule.Renderer = fn;
+rendererModule.DEBUG_set_Renderer(fn);
 ```
 
-To stub a new module, add a group entry in [`mutableModuleGroups.ts`](./lib/mutableModuleGroups.ts):
+**Import the barrel that has a default export.** `cjsInterop` rewrites a default import
+from a bare specifier to `('default' in ns ? ns.default : { ...ns })`. A barrel with no
+default (`viz/core/utils.js`, `viz/core/renderers/renderer.js`) therefore hands the test
+a dead **copy** — seams installed elsewhere stay invisible. Use the `_default` barrel
+(`viz/core/utils_default`, `viz/core/renderers/renderer_default`), which is
+`import * as X; export default X`.
 
-```ts
-{
-  internal: '__internal/viz/core/title.js', // real module under esm/
-  also: ['viz/core/title.js'],            // extra artifact URLs → same facade
-  extraKeys: ['animation/frame'],         // optional bare import-map keys
-  apiFromDefault: true,                   // when default export is the stub target
-}
-```
+Older sources use `exports.DEBUG_set_X = DEBUG_set_X` instead of `export function`;
+`static.ts` rewrites that to a real ESM export at serve time, so both spellings work.
 
-Import-map keys are derived as `strip(.js)` of `internal`/`also`, plus `extraKeys`. Prefer this over a new hand-written shim.
 ---
 
 ## `testing/helpers/esm-shims/`
@@ -93,10 +105,10 @@ Browser modules that the import map (and/or `static.ts` artifact redirects) subs
 
 **Why they exist:**
 
-- **Stubbing / mutation** — prefer `MUTABLE_MODULE_GROUPS` in `mutableModuleGroups.ts` (serve-time generated facades via `autoMutableFacade.ts`). Keep a hand-written shim only for custom composition (e.g. themes).
+- **Custom composition** — e.g. `themes.js`, which the import map and `static.ts` both point at. Stubbing is *not* a reason to add a shim; use a `DEBUG_set_*` seam instead.
 - **Globals bridge** — e.g. `jquery.js` / `knockout.js` re-export the classic `<script>` globals after `noConflict()`.
 - **CSS plugin imports** — suites still write `import 'fluent_blue_light.css!'`; `*.css.js` shims call `injectStylesheet.js` to append `<link>` tags.
 - **Vendor / interop quirks** — thin adapters (`jspdf_autotable.js`, `tslib.js`, `zod.js`, …) when the stock ESM build is awkward for the runner.
-- **Shared helpers** — `mutable_facade.js` (`createMutableApi`, `wrapCtor`) used by generated and hand-written facades; `injectStylesheet.js` for theme CSS.
+- **Shared helpers** — `injectStylesheet.js` for theme CSS.
 
-Do **not** put product fixes in these shims — they are test-runner adapters only. To stub a new module, add it to `MUTABLE_MODULE_GROUPS` first (`internal` / `also` / `extraKeys`).
+Do **not** put product fixes in these shims — they are test-runner adapters only.
diff --git a/packages/devextreme/testing/runner/lib/autoMutableFacade.ts b/packages/devextreme/testing/runner/lib/autoMutableFacade.ts
deleted file mode 100644
index b8aaddf1c0cc..000000000000
--- a/packages/devextreme/testing/runner/lib/autoMutableFacade.ts
+++ /dev/null
@@ -1,588 +0,0 @@
-import * as crypto from 'node:crypto';
-import * as fs from 'node:fs';
-import * as path from 'node:path';
-
-import {
-  MUTABLE_MODULE_GROUPS,
-  type MutableModuleGroup,
-} from './mutableModuleGroups';
-
-export type { MutableModuleGroup };
-export { MUTABLE_MODULE_GROUPS };
-
-const MUTABLE_FACADE_HELPER_URL = '/packages/devextreme/testing/helpers/esm-shims/mutable_facade.js';
-const ESM_ARTIFACT_PREFIX = 'packages/devextreme/artifacts/transpiled-esm-npm/esm/';
-
-const NAMESPACE_DEFAULT_RE = /import\s+\*\s+as\s+([A-Za-z_$][\w$]*)\s+from\s+['"]([^'"]+)['"]\s*;?\s*export\s+default\s+\1\s*;?/;
-
-/** JS keywords / reserved that cannot be a bare `export const name`. */
-const RESERVED_EXPORT_NAMES = new Set([
-  'break', 'case', 'catch', 'class', 'const', 'continue', 'debugger', 'default',
-  'delete', 'do', 'else', 'enum', 'export', 'extends', 'false', 'finally',
-  'for', 'function', 'if', 'import', 'in', 'instanceof', 'new', 'null',
-  'return', 'super', 'switch', 'this', 'throw', 'true', 'try', 'typeof',
-  'var', 'void', 'while', 'with', 'yield', 'await', 'let', 'static',
-  'implements', 'interface', 'package', 'private', 'protected', 'public',
-]);
-
-interface AutoMutableFacadeEntry {
-  /** Workspace-relative path to the real implementation module (no leading slash). */
-  internalRelativePath: string;
-  /** Named exports forwarded with wrapCtor (ctors / replaceable functions). */
-  wrapExportNames: string[];
-  /** Named exports re-exported as call/value forwards (setters, scalars, …). */
-  forwardExportNames: string[];
-  globalKey: string;
-  /**
-   * Build `api` from `namespace.default ?? namespace` (default export is the
-   * stub target object — errors, format_helper, visibility_change, …).
-   */
-  apiFromDefault?: boolean;
-}
-
-/** Hand-written shims that stay (custom composition / non-generic). */
-const HAND_WRITTEN_ESM_FACADES: readonly { esmPath: string; shimUrl: string }[] = [
-  {
-    esmPath: '__internal/ui/themes.js',
-    shimUrl: '/packages/devextreme/testing/helpers/esm-shims/themes.js',
-  },
-  {
-    esmPath: 'ui/themes.js',
-    shimUrl: '/packages/devextreme/testing/helpers/esm-shims/themes.js',
-  },
-];
-
-/** Index keys are ESM-relative (`__internal/viz/…`, `exporter.js`, …). */
-const facadeIndex = new Map<string, AutoMutableFacadeEntry>();
-let indexBuiltForRoot: string | null = null;
-
-function normalizeUrlPath(relativeUrlPath: string): string {
-  return relativeUrlPath.replace(/\\/g, '/').replace(/^\/+/, '');
-}
-
-function stripJs(filePath: string): string {
-  return filePath.endsWith('.js') ? filePath.slice(0, -3) : filePath;
-}
-
-function groupArtifacts(group: MutableModuleGroup): readonly string[] {
-  return group.also ? [group.internal, ...group.also] : [group.internal];
-}
-
-function groupImportMapKeys(group: MutableModuleGroup): string[] {
-  const keys = new Set<string>();
-  for (const artifact of groupArtifacts(group)) {
-    keys.add(stripJs(artifact));
-  }
-  for (const key of group.extraKeys ?? []) {
-    keys.add(key);
-  }
-  return [...keys];
-}
-
-function artifactForImportMapKey(group: MutableModuleGroup, key: string): string {
-  const match = groupArtifacts(group).find(
-    (item) => item === key || item === `${key}.js` || stripJs(item) === key,
-  ) ?? group.internal;
-  return match.endsWith('.js') ? match : `${match}.js`;
-}
-
-/** Strip workspace / URL prefixes down to a path under `…/esm/`. */
-function toEsmRelativePath(urlOrPath: string): string {
-  const normalized = normalizeUrlPath(urlOrPath);
-  const idx = normalized.indexOf(ESM_ARTIFACT_PREFIX);
-  if (idx >= 0) {
-    return normalized.slice(idx + ESM_ARTIFACT_PREFIX.length);
-  }
-  return normalized;
-}
-
-function stripComments(source: string): string {
-  return source
-    .replace(/\/\*[\s\S]*?\*\//g, '')
-    .replace(/^\s*\/\/.*$/gm, '');
-}
-
-/**
- * Pure re-export used by viz public entries:
- *   import * as X from '...';
- *   export default X;
- */
-function parseNamespaceDefaultReexport(
-  source: string,
-): { binding: string; from: string } | null {
-  const cleaned = stripComments(source).trim();
-  const match = NAMESPACE_DEFAULT_RE.exec(cleaned);
-  if (!match) {
-    return null;
-  }
-
-  const remainder = cleaned.replace(match[0], '').trim();
-  if (remainder.length > 0) {
-    return null;
-  }
-
-  const [, binding, from] = match;
-  return { binding, from };
-}
-
-function addNamedExportFromClause(names: Set<string>, part: string): void {
-  const bit = part.trim();
-  if (!bit || bit === 'default') {
-    return;
-  }
-
-  const aliased = /^[A-Za-z_$][\w$]*\s+as\s+([A-Za-z_$][\w$]*)$/.exec(bit);
-  if (aliased) {
-    names.add(aliased[1]);
-    return;
-  }
-
-  const plain = /^([A-Za-z_$][\w$]*)$/.exec(bit);
-  if (plain) {
-    names.add(plain[1]);
-  }
-}
-
-function collectEsmExportNames(source: string): string[] {
-  const names = new Set<string>();
-
-  for (const match of source.matchAll(
-    /export\s+(?:async\s+)?(?:function\s*\*?|class|const|let|var)\s+([A-Za-z_$][\w$]*)/g,
-  )) {
-    names.add(match[1]);
-  }
-
-  for (const match of source.matchAll(/export\s*\{([^}]+)\}/g)) {
-    match[1].split(',').forEach((part) => {
-      addNamedExportFromClause(names, part);
-    });
-  }
-
-  for (const match of source.matchAll(/\bexports\.([A-Za-z_$][\w$]*)\s*=/g)) {
-    names.add(match[1]);
-  }
-
-  names.delete('default');
-  return [...names].sort();
-}
-
-function resolveImportSpecifier(
-  fromFilePath: string,
-  specifier: string,
-  workspaceRoot: string,
-): string | null {
-  const esmRoot = path.join(
-    workspaceRoot,
-    'packages/devextreme/artifacts/transpiled-esm-npm/esm',
-  );
-
-  const candidate = specifier.startsWith('.')
-    ? path.resolve(path.dirname(fromFilePath), specifier)
-    : path.join(esmRoot, specifier);
-
-  const withJs = candidate.endsWith('.js') ? candidate : `${candidate}.js`;
-  if (fs.existsSync(withJs) && fs.statSync(withJs).isFile()) {
-    return withJs;
-  }
-  if (fs.existsSync(candidate) && fs.statSync(candidate).isFile()) {
-    return candidate;
-  }
-  const indexJs = path.join(candidate, 'index.js');
-  if (fs.existsSync(indexJs) && fs.statSync(indexJs).isFile()) {
-    return indexJs;
-  }
-  return null;
-}
-
-function toWorkspaceRelativePath(workspaceRoot: string, absolutePath: string): string {
-  return path.relative(workspaceRoot, absolutePath).split(path.sep).join('/');
-}
-
-function buildGlobalKey(internalRelativePath: string): string {
-  const digest = crypto
-    .createHash('sha1')
-    .update(internalRelativePath)
-    .digest('hex')
-    .slice(0, 16);
-  const hint = internalRelativePath
-    .replace(/^packages\/devextreme\/artifacts\/transpiled-esm-npm\/esm\//, '')
-    .replace(/\.js$/, '')
-    .replace(/[^\w]+/g, '_')
-    .slice(-48);
-  return `__dxAutoMutable_${hint}_${digest}`;
-}
-
-function findExportBySuffix(
-  suffix: string,
-  exportNames: string[],
-  excludeName: string,
-): string | undefined {
-  return exportNames.find((n) => n === suffix)
-    ?? exportNames.find(
-      (n) => n !== excludeName && n.toLowerCase() === suffix.toLowerCase(),
-    );
-}
-
-/**
- * Map test-only setters onto the export they replace on the mutable api.
- * - `DEBUG_set_title` → `Title`
- * - `_setLegend` → `Legend`
- */
-function resolveSetterTarget(
-  setterName: string,
-  exportNames: string[],
-): string | null {
-  const debugMatch = /^DEBUG_set_(.+)$/.exec(setterName);
-  if (debugMatch) {
-    return findExportBySuffix(debugMatch[1], exportNames, setterName) ?? debugMatch[1];
-  }
-
-  const setMatch = /^_set([A-Z].*)$/.exec(setterName);
-  if (!setMatch) {
-    return null;
-  }
-
-  return findExportBySuffix(setMatch[1], exportNames, setterName) ?? null;
-}
-
-function buildDebugSets(
-  wrapExportNames: string[],
-  forwardExportNames: string[],
-): Record<string, string> {
-  const exportNames = [...wrapExportNames, ...forwardExportNames];
-  const debugSets: Record<string, string> = {};
-  for (const name of exportNames) {
-    const target = resolveSetterTarget(name, exportNames);
-    if (target) {
-      debugSets[name] = target;
-    }
-  }
-  return debugSets;
-}
-
-function isFunctionLikeExport(name: string, internalSource: string): boolean {
-  const functionOrClassPattern = new RegExp(
-    `export\\s+(?:async\\s+)?(?:function\\s*\\*?|class)\\s+${name}\\b`,
-  );
-  const assigned = new RegExp(
-    `export\\s+(?:const|let|var)\\s+${name}\\s*=\\s*(?:async\\s+)?function\\b`,
-  );
-  const cjsAssigned = new RegExp(
-    `exports\\.${name}\\s*=\\s*(?:async\\s+)?function\\b`,
-  );
-  // Put optional whitespace inside the negative lookahead so `\s*` cannot
-  // backtrack past a space and then accept `export const plugin = { ... }`.
-  const constNonData = new RegExp(
-    `export\\s+(?:const|let|var)\\s+${name}\\s*=(?!\\s*(?:[{[\\d'"\`\\-]|null\\b|undefined\\b|true\\b|false\\b))`,
-  );
-  const cjsNonData = new RegExp(
-    `exports\\.${name}\\s*=(?!\\s*(?:[{[\\d'"\`\\-]|null\\b|undefined\\b|true\\b|false\\b))`,
-  );
-  return functionOrClassPattern.test(internalSource)
-    || assigned.test(internalSource)
-    || cjsAssigned.test(internalSource)
-    || constNonData.test(internalSource)
-    || cjsNonData.test(internalSource);
-}
-
-function shouldWrapExport(name: string, internalSource: string): boolean {
-  // SCREAMING_SNAKE constants (PANE_PADDING) must stay value forwards.
-  const isScreamingSnake = /^[A-Z][A-Z0-9_]*$/.test(name);
-  const isPascalCase = /^[A-Z]/.test(name) && !isScreamingSnake;
-  const isTestCtorAlias = /^_TESTS_[A-Z]/.test(name);
-  const isTestStubHelper = /_TESTS_.*stub|_stub_/i.test(name);
-  return isPascalCase
-    || isTestCtorAlias
-    || isTestStubHelper
-    || RESERVED_EXPORT_NAMES.has(name)
-    || isFunctionLikeExport(name, internalSource);
-}
-
-function classifyExportNames(
-  exportNames: string[],
-  internalSource: string,
-): { wrapExportNames: string[]; forwardExportNames: string[] } {
-  const wrapExportNames: string[] = [];
-  const forwardExportNames: string[] = [];
-
-  exportNames.forEach((name) => {
-    // Setters that replace another export must use createMutableApi wiring.
-    if (resolveSetterTarget(name, exportNames)) {
-      forwardExportNames.push(name);
-      return;
-    }
-
-    if (shouldWrapExport(name, internalSource)) {
-      wrapExportNames.push(name);
-    } else {
-      forwardExportNames.push(name);
-    }
-  });
-
-  return { wrapExportNames, forwardExportNames };
-}
-
-function emitNamedExport(name: string, expression: string): string {
-  if (RESERVED_EXPORT_NAMES.has(name)) {
-    const alias = `__dxExport_${name}`;
-    return `const ${alias} = ${expression};\nexport { ${alias} as ${name} };`;
-  }
-  return `export const ${name} = ${expression};`;
-}
-
-function generateAutoMutableFacadeSource(entry: AutoMutableFacadeEntry): string {
-  const originalUrl = `/${entry.internalRelativePath}?dx-original=1`;
-  const debugSets = buildDebugSets(entry.wrapExportNames, entry.forwardExportNames);
-  const debugSetsLiteral = JSON.stringify(debugSets);
-  const liveValueNames = entry.forwardExportNames.filter((name) => name.startsWith('_TESTS_'));
-
-  const exportLines = [
-    ...entry.wrapExportNames.map((name) => emitNamedExport(
-      name,
-      `(typeof api.${name} === 'function' ? wrapCtor(api, '${name}') : api.${name})`,
-    )),
-    ...entry.forwardExportNames.map((name) => {
-      if (debugSets[name]) {
-        return emitNamedExport(name, `(...args) => api.${name}(...args)`);
-      }
-      if (name.startsWith('_TESTS_')) {
-        return `export { ${name} } from '${originalUrl}';`;
-      }
-      return emitNamedExport(name, `api.${name}`);
-    }),
-  ];
-
-  const liveApiBindings = liveValueNames.map(
-    (name) => [
-      `Object.defineProperty(api, '${name}', {`,
-      '  configurable: true,',
-      '  enumerable: true,',
-      `  get: () => original.${name},`,
-      '});',
-    ].join('\n'),
-  );
-
-  const helperImport = `import { createMutableApi, wrapCtor } from '${MUTABLE_FACADE_HELPER_URL}';`;
-
-  if (entry.apiFromDefault) {
-    return [
-      '/* auto-generated mutable facade for QUnit (default-export api) */',
-      `import * as originalNs from '${originalUrl}';`,
-      helperImport,
-      '',
-      'const original = originalNs.default ?? originalNs;',
-      'const api = createMutableApi(',
-      '  original && typeof original === \'object\' ? { ...original } : { value: original },',
-      `  '${entry.globalKey}',`,
-      `  ${debugSetsLiteral}`,
-      ');',
-      '',
-      ...exportLines,
-      'export default api;',
-      '',
-    ].join('\n');
-  }
-
-  return [
-    '/* auto-generated mutable facade for QUnit */',
-    `import * as original from '${originalUrl}';`,
-    helperImport,
-    '',
-    `const api = createMutableApi(original, '${entry.globalKey}', ${debugSetsLiteral});`,
-    ...liveApiBindings,
-    '',
-    ...exportLines,
-    'export default api;',
-    '',
-  ].join('\n');
-}
-
-function registerEsmArtifact(esmRelativePath: string, entry: AutoMutableFacadeEntry): void {
-  facadeIndex.set(toEsmRelativePath(esmRelativePath), entry);
-}
-
-function readTextFileOrNull(filePath: string): string | null {
-  try {
-    return fs.readFileSync(filePath, 'utf8');
-  } catch {
-    return null;
-  }
-}
-
-function buildEntryForInternalFile(
-  workspaceRoot: string,
-  internalAbsolute: string,
-  options: { apiFromDefault?: boolean } = {},
-): AutoMutableFacadeEntry | null {
-  const internalSource = readTextFileOrNull(internalAbsolute);
-  if (internalSource === null) {
-    return null;
-  }
-
-  const exportNames = collectEsmExportNames(internalSource);
-  const { wrapExportNames, forwardExportNames } = classifyExportNames(
-    exportNames,
-    internalSource,
-  );
-  const internalRelativePath = toWorkspaceRelativePath(workspaceRoot, internalAbsolute);
-
-  return {
-    internalRelativePath,
-    wrapExportNames,
-    forwardExportNames,
-    globalKey: buildGlobalKey(internalRelativePath),
-    apiFromDefault: options.apiFromDefault,
-  };
-}
-
-function tryRegisterNamespaceDefaultFile(
-  workspaceRoot: string,
-  absoluteFilePath: string,
-): AutoMutableFacadeEntry | null {
-  const source = readTextFileOrNull(absoluteFilePath);
-  if (source === null) {
-    return null;
-  }
-
-  const parsed = parseNamespaceDefaultReexport(source);
-  if (!parsed) {
-    return null;
-  }
-
-  const internalAbsolute = resolveImportSpecifier(
-    absoluteFilePath,
-    parsed.from,
-    workspaceRoot,
-  );
-  if (!internalAbsolute) {
-    return null;
-  }
-
-  const entry = buildEntryForInternalFile(workspaceRoot, internalAbsolute);
-  if (!entry) {
-    return null;
-  }
-
-  registerEsmArtifact(toWorkspaceRelativePath(workspaceRoot, absoluteFilePath), entry);
-  registerEsmArtifact(entry.internalRelativePath, entry);
-  return entry;
-}
-
-function walkJsFiles(dir: string, acc: string[] = []): string[] {
-  if (!fs.existsSync(dir)) {
-    return acc;
-  }
-  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
-    const full = path.join(dir, entry.name);
-    if (entry.isDirectory()) {
-      walkJsFiles(full, acc);
-    } else if (entry.isFile() && entry.name.endsWith('.js')) {
-      acc.push(full);
-    }
-  }
-  return acc;
-}
-
-function isSmallPublicReexportCandidate(filePath: string): boolean {
-  try {
-    return fs.statSync(filePath).size <= 2000;
-  } catch {
-    return false;
-  }
-}
-
-function registerForcedMutableGroups(workspaceRoot: string): void {
-  const esmRoot = path.join(
-    workspaceRoot,
-    'packages/devextreme/artifacts/transpiled-esm-npm/esm',
-  );
-
-  MUTABLE_MODULE_GROUPS.forEach((group) => {
-    const internalAbsolute = path.join(esmRoot, group.internal);
-    const entry = buildEntryForInternalFile(workspaceRoot, internalAbsolute, {
-      apiFromDefault: group.apiFromDefault,
-    });
-    if (!entry) {
-      return;
-    }
-
-    groupArtifacts(group).forEach((artifact) => {
-      registerEsmArtifact(artifact, entry);
-    });
-  });
-}
-
-export function ensureAutoMutableFacadeIndex(workspaceRoot: string): void {
-  if (indexBuiltForRoot === workspaceRoot) {
-    return;
-  }
-
-  facadeIndex.clear();
-  registerForcedMutableGroups(workspaceRoot);
-
-  const vizRoot = path.join(
-    workspaceRoot,
-    'packages/devextreme/artifacts/transpiled-esm-npm/esm/viz',
-  );
-
-  walkJsFiles(vizRoot)
-    .filter((filePath) => isSmallPublicReexportCandidate(filePath))
-    .forEach((filePath) => {
-      tryRegisterNamespaceDefaultFile(workspaceRoot, filePath);
-    });
-
-  indexBuiltForRoot = workspaceRoot;
-}
-
-/**
- * Import-map entries for forced mutable modules → ESM artifact URLs
- * (served as generated facades by static.ts).
- */
-export function buildMutableModuleImportMapEntries(esmRootUrl: string): Record<string, string> {
-  const entries: Record<string, string> = {};
-
-  MUTABLE_MODULE_GROUPS.forEach((group) => {
-    groupImportMapKeys(group).forEach((key) => {
-      entries[key] = `${esmRootUrl}/${artifactForImportMapKey(group, key)}`;
-    });
-  });
-
-  return entries;
-}
-
-export function findHandWrittenMutableFacade(relativeUrlPath: string): string | null {
-  const esmPath = toEsmRelativePath(relativeUrlPath);
-  const match = HAND_WRITTEN_ESM_FACADES.find((entry) => entry.esmPath === esmPath);
-  return match?.shimUrl ?? null;
-}
-
-/**
- * Returns generated facade source for a forced mutable module or a
- * namespace-default public entry, or null when not applicable.
- */
-export function tryBuildAutoMutableFacade(
-  relativeUrlPath: string,
-  absoluteFilePath: string,
-  workspaceRoot: string,
-): string | null {
-  ensureAutoMutableFacadeIndex(workspaceRoot);
-
-  const esmKey = toEsmRelativePath(relativeUrlPath);
-  let entry = facadeIndex.get(esmKey);
-
-  if (!entry) {
-    const registered = tryRegisterNamespaceDefaultFile(workspaceRoot, absoluteFilePath);
-    if (!registered) {
-      return null;
-    }
-    entry = registered;
-  }
-
-  return generateAutoMutableFacadeSource(entry);
-}
-
-/** Test helper: reset in-memory index. */
-export function resetAutoMutableFacadeIndexForTests(): void {
-  facadeIndex.clear();
-  indexBuiltForRoot = null;
-}
diff --git a/packages/devextreme/testing/runner/lib/handWrittenShims.ts b/packages/devextreme/testing/runner/lib/handWrittenShims.ts
new file mode 100644
index 000000000000..89ed7f00811c
--- /dev/null
+++ b/packages/devextreme/testing/runner/lib/handWrittenShims.ts
@@ -0,0 +1,23 @@
+const HAND_WRITTEN_ESM_SHIMS: readonly { esmPath: string; shimUrl: string }[] = [
+  {
+    esmPath: '__internal/ui/themes.js',
+    shimUrl: '/packages/devextreme/testing/helpers/esm-shims/themes.js',
+  },
+  {
+    esmPath: 'ui/themes.js',
+    shimUrl: '/packages/devextreme/testing/helpers/esm-shims/themes.js',
+  },
+];
+
+const ESM_ARTIFACT_PREFIX = 'packages/devextreme/artifacts/transpiled-esm-npm/esm/';
+
+export function findHandWrittenShim(relativeUrlPath: string): string | null {
+  const normalized = relativeUrlPath.replace(/\\/g, '/').replace(/^\/+/, '');
+  const idx = normalized.indexOf(ESM_ARTIFACT_PREFIX);
+  const esmPath = idx >= 0
+    ? normalized.slice(idx + ESM_ARTIFACT_PREFIX.length)
+    : normalized;
+
+  const match = HAND_WRITTEN_ESM_SHIMS.find((entry) => entry.esmPath === esmPath);
+  return match?.shimUrl ?? null;
+}
diff --git a/packages/devextreme/testing/runner/lib/importMap.ts b/packages/devextreme/testing/runner/lib/importMap.ts
index 01384871feb7..89c7716b8913 100644
--- a/packages/devextreme/testing/runner/lib/importMap.ts
+++ b/packages/devextreme/testing/runner/lib/importMap.ts
@@ -1,8 +1,6 @@
 import * as fs from 'node:fs';
 import * as path from 'node:path';
 
-import { buildMutableModuleImportMapEntries } from './autoMutableFacade';
-
 const ESM_ROOT = '/packages/devextreme/artifacts/transpiled-esm-npm/esm';
 const SHIMS = '/packages/devextreme/testing/helpers/esm-shims';
 const NODE_MODULES = '/packages/devextreme/node_modules';
@@ -77,6 +75,10 @@ function withCacheBuster(url: string, cacheBuster: string): string {
     return url;
   }
 
+  if (url.startsWith(ESM_ROOT)) {
+    return url;
+  }
+
   return `${url}${url.includes('?') ? '&' : '?'}${cacheBuster}`;
 }
 
@@ -240,18 +242,23 @@ function collectPackageRootEntries(): Record<string, string> {
   fs.readdirSync(ESM_FS_ROOT, { withFileTypes: true }).forEach((entry) => {
     if (entry.isFile() && entry.name.endsWith('.js')) {
       const name = entry.name.slice(0, -3);
-      const url = `${ESM_ROOT}/${entry.name}`;
+      // Extensionless, like the `viz/` `core/` `common/` prefix maps: artifacts import
+      // root modules as `../../exporter`, and a second URL for the same file would give
+      // the browser a second module instance with its own copy of every binding.
+      const url = `${ESM_ROOT}/${name}`;
       entries[name] = url;
       // Suites often `require('aspnet.js')` / `require('color.js')` with the extension.
       entries[entry.name] = url;
       return;
     }
 
-    // Package folders with index.js (e.g. events → events/index.js)
+    // Package folders with index.js (e.g. events → events/index.js), mapped
+    // extensionless for the same reason as the file branch above: artifacts
+    // import them as `../events`, and the server resolves the index itself.
     if (entry.isDirectory()) {
       const indexPath = path.join(ESM_FS_ROOT, entry.name, 'index.js');
       if (fs.existsSync(indexPath)) {
-        entries[entry.name] = `${ESM_ROOT}/${entry.name}/index.js`;
+        entries[entry.name] = `${ESM_ROOT}/${entry.name}`;
       }
     }
   });
@@ -289,8 +296,6 @@ export function buildQunitImportMap({
 
     // Exact package-root entries (exporter, color, localization, events, …)
     ...collectPackageRootEntries(),
-    // Forced mutable facades → ESM artifacts (generated at serve-time).
-    ...buildMutableModuleImportMapEntries(ESM_ROOT),
 
     jquery: jqueryUrl.includes('noJQuery') ? jqueryUrl : `${SHIMS}/jquery.js`,
 
@@ -342,58 +347,7 @@ export function buildQunitImportMap({
     'material_blue_light.css!': `${SHIMS}/material_blue_light.css.js`,
     'gantt.css!': `${SHIMS}/gantt.css.js`,
 
-    // Auto-mutable modules are provided by buildMutableModuleImportMapEntries above.
-    // Hand-written only where composition is custom (themes).
-    'viz/core/base_theme_manager': `${ESM_ROOT}/viz/core/base_theme_manager.js`,
-    'viz/chart_components/layout_manager': `${ESM_ROOT}/viz/chart_components/layout_manager.js`,
-    'viz/chart_components/scroll_bar': `${ESM_ROOT}/viz/chart_components/scroll_bar.js`,
-    'viz/chart_components/crosshair': `${ESM_ROOT}/viz/chart_components/crosshair.js`,
-    'viz/components/chart_theme_manager': `${ESM_ROOT}/viz/components/chart_theme_manager.js`,
-    'viz/components/data_validator': `${ESM_ROOT}/viz/components/data_validator.js`,
-    'viz/series/points/base_point': `${ESM_ROOT}/viz/series/points/base_point.js`,
-    'viz/series/base_series': `${ESM_ROOT}/viz/series/base_series.js`,
-    'viz/core/series_family': `${ESM_ROOT}/viz/core/series_family.js`,
-    'viz/series/points/label': `${ESM_ROOT}/viz/series/points/label.js`,
-    'viz/translators/range': `${ESM_ROOT}/viz/translators/range.js`,
-    'viz/translators/translator1d': `${ESM_ROOT}/viz/translators/translator1d.js`,
-    'viz/core/plaque': `${ESM_ROOT}/viz/core/plaque.js`,
-    'viz/range_selector/tracker': `${ESM_ROOT}/viz/range_selector/tracker.js`,
-    'viz/range_selector/series_data_source': `${ESM_ROOT}/viz/range_selector/series_data_source.js`,
-    'viz/range_selector/sliders_controller': `${ESM_ROOT}/viz/range_selector/sliders_controller.js`,
-    'viz/vector_map/projection.main': `${ESM_ROOT}/viz/vector_map/projection.main.js`,
-    'viz/vector_map/control_bar/control_bar': `${ESM_ROOT}/viz/vector_map/control_bar/control_bar.js`,
-    'viz/vector_map/gesture_handler': `${ESM_ROOT}/viz/vector_map/gesture_handler.js`,
-    'viz/vector_map/tracker': `${ESM_ROOT}/viz/vector_map/tracker.js`,
-    'viz/vector_map/data_exchanger': `${ESM_ROOT}/viz/vector_map/data_exchanger.js`,
-    'viz/vector_map/legend': `${ESM_ROOT}/viz/vector_map/legend.js`,
-    'viz/vector_map/layout': `${ESM_ROOT}/viz/vector_map/layout.js`,
-    'viz/vector_map/map_layer': `${ESM_ROOT}/viz/vector_map/map_layer.js`,
-    'viz/vector_map/tooltip_viewer': `${ESM_ROOT}/viz/vector_map/tooltip_viewer.js`,
-    '__internal/viz/core/base_theme_manager': `${ESM_ROOT}/__internal/viz/core/base_theme_manager.js`,
-    '__internal/viz/chart_components/layout_manager': `${ESM_ROOT}/__internal/viz/chart_components/layout_manager.js`,
-    '__internal/viz/chart_components/scroll_bar': `${ESM_ROOT}/__internal/viz/chart_components/scroll_bar.js`,
-    '__internal/viz/chart_components/crosshair': `${ESM_ROOT}/__internal/viz/chart_components/crosshair.js`,
-    '__internal/viz/components/chart_theme_manager': `${ESM_ROOT}/__internal/viz/components/chart_theme_manager.js`,
-    '__internal/viz/components/data_validator': `${ESM_ROOT}/__internal/viz/components/data_validator.js`,
-    '__internal/viz/series/points/base_point': `${ESM_ROOT}/__internal/viz/series/points/base_point.js`,
-    '__internal/viz/series/base_series': `${ESM_ROOT}/__internal/viz/series/base_series.js`,
-    '__internal/viz/core/series_family': `${ESM_ROOT}/__internal/viz/core/series_family.js`,
-    '__internal/viz/series/points/label': `${ESM_ROOT}/__internal/viz/series/points/label.js`,
-    '__internal/viz/translators/range': `${ESM_ROOT}/__internal/viz/translators/range.js`,
-    '__internal/viz/translators/translator1d': `${ESM_ROOT}/__internal/viz/translators/translator1d.js`,
-    '__internal/viz/core/plaque': `${ESM_ROOT}/__internal/viz/core/plaque.js`,
-    '__internal/viz/range_selector/tracker': `${ESM_ROOT}/__internal/viz/range_selector/tracker.js`,
-    '__internal/viz/range_selector/series_data_source': `${ESM_ROOT}/__internal/viz/range_selector/series_data_source.js`,
-    '__internal/viz/range_selector/sliders_controller': `${ESM_ROOT}/__internal/viz/range_selector/sliders_controller.js`,
-    '__internal/viz/vector_map/projection.main': `${ESM_ROOT}/__internal/viz/vector_map/projection.main.js`,
-    '__internal/viz/vector_map/control_bar/control_bar': `${ESM_ROOT}/__internal/viz/vector_map/control_bar/control_bar.js`,
-    '__internal/viz/vector_map/gesture_handler': `${ESM_ROOT}/__internal/viz/vector_map/gesture_handler.js`,
-    '__internal/viz/vector_map/tracker': `${ESM_ROOT}/__internal/viz/vector_map/tracker.js`,
-    '__internal/viz/vector_map/data_exchanger': `${ESM_ROOT}/__internal/viz/vector_map/data_exchanger.js`,
-    '__internal/viz/vector_map/legend': `${ESM_ROOT}/__internal/viz/vector_map/legend.js`,
-    '__internal/viz/vector_map/layout': `${ESM_ROOT}/__internal/viz/vector_map/layout.js`,
-    '__internal/viz/vector_map/map_layer': `${ESM_ROOT}/__internal/viz/vector_map/map_layer.js`,
-    '__internal/viz/vector_map/tooltip_viewer': `${ESM_ROOT}/__internal/viz/vector_map/tooltip_viewer.js`,
+    // Hand-written shim: theme composition is custom.
     'ui/themes': `${SHIMS}/themes.js`,
     '__internal/ui/themes': `${SHIMS}/themes.js`,
 
diff --git a/packages/devextreme/testing/runner/lib/mutableModuleGroups.ts b/packages/devextreme/testing/runner/lib/mutableModuleGroups.ts
deleted file mode 100644
index 6e07f6af6a8a..000000000000
--- a/packages/devextreme/testing/runner/lib/mutableModuleGroups.ts
+++ /dev/null
@@ -1,121 +0,0 @@
-/**
- * Modules that always get a generated mutable facade (sinon.stub targets).
- * `internal` is wrapped via `?dx-original=1`; `also` aliases share one globalThis api.
- *
- * Keep hand-written shims only for non-generic cases (themes composition,
- * CSS inject, jquery globals, …).
- *
- * Consumed by `autoMutableFacade.ts` (serve-time codegen) and import-map build.
- */
-export interface MutableModuleGroup {
-  /** Path under `artifacts/transpiled-esm-npm/esm/`. */
-  internal: string;
-  /** Extra ESM artifact paths that share the same facade/api. */
-  also?: readonly string[];
-  /** Import-map bare keys beyond those derived from internal/also (strip `.js`). */
-  extraKeys?: readonly string[];
-  apiFromDefault?: boolean;
-}
-
-export const MUTABLE_MODULE_GROUPS: readonly MutableModuleGroup[] = [
-  {
-    internal: '__internal/viz/core/renderers/renderer.js',
-    also: ['viz/core/renderers/renderer_default.js'],
-    extraKeys: ['viz/core/renderers/renderer'],
-  },
-  {
-    internal: '__internal/viz/core/renderers/animation.js',
-    also: ['viz/core/renderers/animation.js'],
-  },
-  {
-    internal: '__internal/viz/core/utils.js',
-    also: ['viz/core/utils.js', 'viz/core/utils_default.js'],
-  },
-  {
-    internal: '__internal/viz/axes/base_axis.js',
-    extraKeys: ['viz/axes/base_axis'],
-  },
-  {
-    internal: 'exporter.js',
-    extraKeys: ['exporter.js'],
-  },
-  {
-    internal: 'format_helper.js',
-    extraKeys: ['format_helper.js'],
-    apiFromDefault: true,
-  },
-  {
-    internal: '__internal/viz/translators/translator2d.js',
-    extraKeys: ['viz/translators/translator2d'],
-  },
-  {
-    internal: '__internal/viz/axes/tick_generator.js',
-    extraKeys: ['viz/axes/tick_generator'],
-  },
-  {
-    internal: '__internal/viz/core/tooltip.js',
-    also: ['viz/core/tooltip.js'],
-  },
-  {
-    internal: '__internal/viz/core/title.js',
-    also: ['viz/core/title.js'],
-  },
-  {
-    internal: '__internal/viz/core/export.js',
-    also: [
-      '__internal/viz/core/exportModule.js',
-      'viz/core/export.js',
-    ],
-  },
-  {
-    internal: '__internal/viz/chart_components/tracker.js',
-    also: ['viz/chart_components/tracker.js'],
-  },
-  {
-    internal: '__internal/viz/components/legend.js',
-    also: ['viz/components/legend.js'],
-  },
-  {
-    internal: '__internal/viz/core/loading_indicator.js',
-    also: ['viz/core/loading_indicator.js'],
-  },
-  {
-    internal: '__internal/core/localization/ldml/date.parser.js',
-    also: [
-      '__internal/core/localization/ldml/dateParserModule.js',
-      'common/core/localization/ldml/date.parser.js',
-    ],
-  },
-  {
-    internal: '__internal/events/m_visibility_change.js',
-    also: ['common/core/events/visibility_change.js'],
-    apiFromDefault: true,
-  },
-  {
-    internal: 'core/errors.js',
-    apiFromDefault: true,
-  },
-  {
-    internal: 'ui/widget/ui.errors.js',
-    apiFromDefault: true,
-  },
-  {
-    internal: '__internal/core/m_template_manager.js',
-    apiFromDefault: true,
-  },
-  {
-    // Real named exports live in palette.js; paletteModule.js is only
-    // `import * as PaletteModule from './palette'; export default PaletteModule`.
-    internal: '__internal/viz/palette.js',
-    also: ['__internal/viz/paletteModule.js'],
-    extraKeys: ['viz/palette'],
-  },
-  {
-    internal: '__internal/common/core/animation/frame.js',
-    also: [
-      'common/core/animation/frame.js',
-      '__internal/common/core/animation/frameModule.js',
-    ],
-    extraKeys: ['animation/frame'],
-  },
-];
diff --git a/packages/devextreme/testing/runner/lib/static.ts b/packages/devextreme/testing/runner/lib/static.ts
index 85c1c20b36cb..1da74433d804 100644
--- a/packages/devextreme/testing/runner/lib/static.ts
+++ b/packages/devextreme/testing/runner/lib/static.ts
@@ -2,12 +2,12 @@ import * as fs from 'node:fs';
 import { IncomingMessage, ServerResponse } from 'node:http';
 import * as path from 'node:path';
 
-import { findHandWrittenMutableFacade, tryBuildAutoMutableFacade } from './autoMutableFacade';
 import {
   isQunitTestOrHelperPath,
   rewriteAspnetArtifactToEsm,
   rewriteQunitTestHelperSource,
 } from './cjsInterop';
+import { findHandWrittenShim } from './handWrittenShims';
 import { setNoCacheHeaders as applyNoCacheHeaders } from './http';
 
 interface StaticFileServiceDeps {
@@ -378,7 +378,7 @@ function sendJsonAsEsmModule(res: ServerResponse, filePath: string): boolean {
 
 // --- Mutable artifact facades ---------------------------------------------------
 
-function sendMutableFacadeModule(res: ServerResponse, shimUrl: string): boolean {
+function sendShimModule(res: ServerResponse, shimUrl: string): boolean {
   // Serve a re-export at the artifact URL so relative library imports and
   // bare import-map entries share the same shim module graph.
   return sendJsModuleBody(
@@ -575,21 +575,10 @@ export function createStaticFileService({
       );
     }
 
-    // Relative library imports bypass import maps — serve mutable facades
-    // at the artifact URL unless ?dx-original=1 (used by the facade itself).
-    // Hand-written shims (themes, …) win; otherwise auto-generate.
     if (!searchParams.has('dx-original')) {
-      const shimUrl = findHandWrittenMutableFacade(relativeUrlPath);
+      const shimUrl = findHandWrittenShim(relativeUrlPath);
       if (shimUrl) {
-        return sendMutableFacadeModule(res, shimUrl);
-      }
-      const autoFacade = tryBuildAutoMutableFacade(
-        relativeUrlPath,
-        resolvedFilePath,
-        rootDirectory,
-      );
-      if (autoFacade) {
-        return sendJsModuleBody(res, autoFacade);
+        return sendShimModule(res, shimUrl);
       }
     }
 
diff --git a/packages/devextreme/testing/tests/DevExpress.animation/fx.tests.js b/packages/devextreme/testing/tests/DevExpress.animation/fx.tests.js
index 68e939713614..5b25cee2a986 100644
--- a/packages/devextreme/testing/tests/DevExpress.animation/fx.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.animation/fx.tests.js
@@ -4,6 +4,7 @@ import eventsEngine from 'common/core/events/core/events_engine';
 import fx from 'common/core/animation/fx';
 import translator from 'common/core/animation/translator';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import positionUtils from 'common/core/animation/position';
 import support from '__internal/core/utils/m_support';
 
@@ -75,7 +76,7 @@ QUnit.module('frame transitions', {
 
         this.clock = sinon.useFakeTimers();
 
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             return setTimeout(callback, 1);
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.animation/position.tests.js b/packages/devextreme/testing/tests/DevExpress.animation/position.tests.js
index 84f4b67bd58c..817c90f1fcd0 100644
--- a/packages/devextreme/testing/tests/DevExpress.animation/position.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.animation/position.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import positionUtils from 'common/core/animation/position';
 import translator from '__internal/common/core/animation/translatorModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import browser from 'core/utils/browser';
 import fixtures from '../../helpers/positionFixtures.js';
 import { implementationsMap } from 'core/utils/size';
@@ -1020,7 +1021,7 @@ const testCollision = (name, fixtureName, params, expectedHorzDist, expectedVert
 
     // T664522
     QUnit.test('setup should call resetPosition with finishTransition argument', function(assert) {
-        const resetPositionStub = sinon.stub(translator, 'resetPosition').callsFake(($element, finishTransition) => {
+        const resetPositionStub = stubSeam(translator, 'resetPosition', 'DEBUG_set_resetPosition').callsFake(($element, finishTransition) => {
             assert.equal(finishTransition, true, 'finishTransition is true');
         });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.dataGrid/gridView.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.dataGrid/gridView.tests.js
index c613ebdb395d..50e953df54df 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.dataGrid/gridView.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.dataGrid/gridView.tests.js
@@ -1,5 +1,5 @@
 import devices from '__internal/core/m_devices';
-import visibilityChange from 'common/core/events/visibility_change';
+import * as visibilityChange from 'common/core/events/visibility_change';
 import 'fluent_blue_light.css!';
 import $ from 'jquery';
 import 'ui/data_grid';
@@ -913,23 +913,29 @@ QUnit.module('Grid view', {
 
         this.createGridView(this.defaultOptions);
 
-        visibilityChange.triggerShownEvent = function() {
+        const triggerShownEventInitial = visibilityChange.triggerShownEvent;
+
+        visibilityChange.DEBUG_set_triggerShownEvent(function() {
             isShownEventTriggered = true;
-        };
+        });
 
         this.resizingController.component._fireContentReadyAction = function() {
             isContentReadyCalled = true;
         };
 
-        // act
-        this.resizingController._initPostRenderHandlers();
-        this.resizingController._refreshSizesHandler({
-            changeType: 'updateSelection',
-        });
+        try {
+            // act
+            this.resizingController._initPostRenderHandlers();
+            this.resizingController._refreshSizesHandler({
+                changeType: 'updateSelection',
+            });
 
-        // assert
-        assert.ok(!isShownEventTriggered, 'shown event');
-        assert.ok(!isContentReadyCalled, 'content ready');
+            // assert
+            assert.ok(!isShownEventTriggered, 'shown event');
+            assert.ok(!isContentReadyCalled, 'content ready');
+        } finally {
+            visibilityChange.DEBUG_set_triggerShownEvent(triggerShownEventInitial);
+        }
     });
 
     QUnit.test('Render scrollable when there is max height (T427967)', function(assert) {
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
index 69b3b7bd9bbb..a58a2ede028e 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import { renderDateParts, getDatePartIndexByPosition } from '__internal/ui/date_box/date_box.mask.parts';
 import dateParser from '__internal/core/localization/ldml/dateParserModule';
+import { spySeam } from '../../helpers/moduleSeam.js';
 import dateLocalization from 'common/core/localization/date';
 import localization from 'localization';
 import { noop } from 'core/utils/common';
@@ -1761,7 +1762,7 @@ module('Options changed', setupModule, () => {
     });
 
     test('performance - value change should not lead to recreate regexp and format pattern', function(assert) {
-        const regExpInfo = sinon.spy(dateParser, 'getRegExpInfo');
+        const regExpInfo = spySeam(dateParser, 'getRegExpInfo', 'DEBUG_set_getRegExpInfo');
 
         this.instance.option('displayFormat', 'dd.MM');
         assert.strictEqual(regExpInfo.callCount, 1, 'regexpInfo should be called when format changed');
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.form/form.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.form/form.tests.js
index 0f7a304b3962..3533d04adc83 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.form/form.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.form/form.tests.js
@@ -6,7 +6,8 @@ import resizeCallbacks from '__internal/core/utils/m_resize_callbacks';
 import typeUtils from 'core/utils/type';
 import { extend } from 'core/utils/extend';
 import messageLocalization from 'localization/message';
-import visibilityEventsModule from 'common/core/events/visibility_change';
+import * as visibilityEventsModule from 'common/core/events/visibility_change';
+import { spyVisibilityEvent } from '../../helpers/visibilityChangeMock.js';
 import { TABS_ITEM_CLASS } from '__internal/ui/tabs/tabs';
 import 'fluent_blue_light.css!';
 import $ from 'jquery';
@@ -1042,7 +1043,7 @@ QUnit.module('T986577', () => {
     }
 
     QUnit.test('Toolbar is rendered inside form. alignItemLabels = false', function(assert) {
-        const resizeEventSpy = sinon.spy(visibilityEventsModule, 'triggerResizeEvent');
+        const resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
         const $form = $('#form').dxForm(extend({ alignItemLabels: false }, getFormConfig()));
 
         const resizeEventArg = resizeEventSpy.getCall(0).args[0];
@@ -1055,7 +1056,7 @@ QUnit.module('T986577', () => {
     });
 
     QUnit.test('Toolbar is rendered inside form. alignItemLabels = true', function(assert) {
-        const resizeEventSpy = sinon.spy(visibilityEventsModule, 'triggerResizeEvent');
+        const resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
         const $form = $('#form').dxForm(extend({ alignItemLabels: true }, getFormConfig()));
 
         const resizeEventArg = resizeEventSpy.getCall(0).args[0];
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/animator.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/animator.tests.js
index 0d5648193c56..f75bb2a0a63f 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/animator.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/animator.tests.js
@@ -1,12 +1,13 @@
 import Animator from '__internal/ui/scroll_view/animator';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const REQUEST_ANIMATION_FRAME_TIMEOUT = 10;
 
 QUnit.module('Animator', {
     beforeEach: function() {
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             return window.setTimeout(callback, REQUEST_ANIMATION_FRAME_TIMEOUT);
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/draggable.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/draggable.tests.js
index 4853c0288d5c..a213047904a8 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/draggable.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/draggable.tests.js
@@ -4,6 +4,7 @@ import pointerMock from '../../helpers/pointerMock.js';
 import viewPort from 'core/utils/view_port';
 import GestureEmitter from 'common/core/events/gesture/emitter.gesture.js';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import translator from 'common/core/animation/translator';
 import fx from 'common/core/animation/fx';
 import keyboardMock from '../../helpers/keyboardMock.js';
@@ -1664,7 +1665,7 @@ QUnit.module('autoScroll', $.extend({}, moduleConfig, {
         this.clock = sinon.useFakeTimers();
         setupDraggable(this, $('#scrollableItem'));
 
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             return window.setTimeout(callback, 10);
         });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/drawer.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/drawer.tests.js
index 7ca9ed022c71..25c7f056db2b 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/drawer.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/drawer.tests.js
@@ -7,7 +7,7 @@ import resizeCallbacks from 'core/utils/resize_callbacks';
 import typeUtils from 'core/utils/type';
 import { addShadowDomStyles } from 'core/utils/shadow_dom';
 import eventsEngine from 'common/core/events/core/events_engine';
-import visibilityChange from 'common/core/events/visibility_change';
+import * as visibilityChange from 'common/core/events/visibility_change';
 import $ from 'jquery';
 import Button from 'ui/button';
 import Drawer from 'ui/drawer';
@@ -281,16 +281,16 @@ QUnit.module('Drawer behavior', () => {
 
         const triggerResizeEventInitial = visibilityChange.triggerResizeEvent;
 
-        visibilityChange.triggerResizeEvent = ($element) => {
+        visibilityChange.DEBUG_set_triggerResizeEvent(($element) => {
             assert.ok(true, 'resize event call is expected');
             assert.equal($element, drawer.viewContent(), 'ViewContent element is expected');
             const rect = $(drawer.viewContent())[0].getBoundingClientRect();
             assert.strictEqual(rect.width, 90, 'ViewContent element width');
             assert.strictEqual(rect.height, 50, 'ViewContent element height');
 
-            visibilityChange.triggerResizeEvent = triggerResizeEventInitial;
+            visibilityChange.DEBUG_set_triggerResizeEvent(triggerResizeEventInitial);
             done();
-        };
+        });
 
         drawer.toggle();
     });
@@ -311,18 +311,18 @@ QUnit.module('Drawer behavior', () => {
         const triggerFunction = visibilityChange.triggerResizeEvent;
 
         try {
-            visibilityChange.triggerResizeEvent = ($element) => {
+            visibilityChange.DEBUG_set_triggerResizeEvent(($element) => {
                 assert.ok(true, 'resize event call is expected');
                 assert.equal($element, drawer.viewContent(), 'ViewContent element is expected');
 
                 const rect = $(drawer.viewContent())[0].getBoundingClientRect();
                 assert.strictEqual(rect.width, 90, 'ViewContent element width');
                 assert.strictEqual(rect.height, 50, 'ViewContent element height');
-            };
+            });
 
             drawer.toggle();
         } finally {
-            visibilityChange.triggerResizeEvent = triggerFunction;
+            visibilityChange.DEBUG_set_triggerResizeEvent(triggerFunction);
         }
     });
 
@@ -337,15 +337,15 @@ QUnit.module('Drawer behavior', () => {
         assert.expect(2);
 
         try {
-            visibilityChange.triggerResizeEvent = function($element) {
+            visibilityChange.DEBUG_set_triggerResizeEvent(function($element) {
                 assert.ok(true, 'event was triggered');
                 assert.equal($element, instance.viewContent(), 'Event was triggered for right element');
-            };
+            });
 
             instance.option('position', 'left');
 
         } finally {
-            visibilityChange.triggerResizeEvent = triggerFunction;
+            visibilityChange.DEBUG_set_triggerResizeEvent(triggerFunction);
         }
     });
 
@@ -979,7 +979,7 @@ QUnit.module('Drawer behavior', () => {
                                     minSize: minSize
                                 }).dxDrawer('instance');
 
-                                visibilityChange.triggerResizeEvent = ($element) => {
+                                visibilityChange.DEBUG_set_triggerResizeEvent(($element) => {
                                     resizeCallCount++;
                                     assert.strictEqual(resizeCallCount, 1, 'resize event should be triggered once');
                                     assert.equal($element, drawer.viewContent(), 'ViewContent element is expected');
@@ -993,9 +993,9 @@ QUnit.module('Drawer behavior', () => {
                                     assert.strictEqual(viewRect.width, expectedViewRect.width, 'ViewContent width');
                                     assert.strictEqual(viewRect.height, expectedViewRect.height, 'ViewContent height');
 
-                                    visibilityChange.triggerResizeEvent = triggerResizeEventInitial;
+                                    visibilityChange.DEBUG_set_triggerResizeEvent(triggerResizeEventInitial);
                                     done();
-                                };
+                                });
 
                                 drawer.toggle();
                             });
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/gallery.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/gallery.tests.js
index d4627e9de67f..ff68e064e97e 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/gallery.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/gallery.tests.js
@@ -1,10 +1,11 @@
 import { getHeight, getOuterHeight, getOuterWidth, getWidth } from 'core/utils/size';
 import $ from 'jquery';
 import { DataSource } from 'common/data/data_source/data_source';
-import visibilityChange from 'common/core/events/visibility_change';
+import { spyVisibilityEvent } from '../../helpers/visibilityChangeMock.js';
 import ArrayStore from 'common/data/array_store';
 import fx from 'common/core/animation/fx';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import resizeCallbacks from 'core/utils/resize_callbacks';
 import { isRenderer } from 'core/utils/type';
 import config from 'core/config';
@@ -731,7 +732,7 @@ QUnit.module('behavior', {
     });
 
     QUnit.test('resizeCallback is called after item is rendered (T1132935)', function(assert) {
-        const resizeEventSpy = sinon.spy(visibilityChange, 'triggerResizeEvent');
+        const resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
 
         this.$element.dxGallery({
             items: [0, 1, 2, 3],
@@ -2176,7 +2177,7 @@ QUnit.module('api', {
     QUnit.test('animationDuration', function(assert) {
         fx.off = false;
 
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             return window.setTimeout(callback, 10);
         });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/overlay.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/overlay.tests.js
index 9b60cc53f2b4..8010f8a63cf5 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/overlay.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/overlay.tests.js
@@ -10,7 +10,9 @@ import resizeCallbacks from 'core/utils/resize_callbacks';
 import { isRenderer } from 'core/utils/type';
 import { value as viewPort } from 'core/utils/view_port';
 import eventsEngine from 'common/core/events/core/events_engine';
-import visibilityChange, { triggerHidingEvent, triggerShownEvent } from 'common/core/events/visibility_change';
+import * as visibilityChange from 'common/core/events/visibility_change';
+import { triggerHidingEvent, triggerShownEvent } from 'common/core/events/visibility_change';
+import { stubVisibilityEvent } from '../../helpers/visibilityChangeMock.js';
 import $ from 'jquery';
 import { hideCallback as hideTopOverlayCallback } from 'common/core/environment/hide_callback';
 import errors from 'core/errors';
@@ -778,9 +780,9 @@ testModule('visibility', moduleConfig, () => {
         const triggerFunction = visibilityChange.triggerResizeEvent;
 
         try {
-            visibilityChange.triggerResizeEvent = () => {
+            visibilityChange.DEBUG_set_triggerResizeEvent(() => {
                 assert.ok(true, 'event triggered');
-            };
+            });
 
             const $overlay = $('#overlay').dxOverlay({ visible: true });
             const overlay = $overlay.dxOverlay('instance');
@@ -789,7 +791,7 @@ testModule('visibility', moduleConfig, () => {
             overlay.show();
 
         } finally {
-            visibilityChange.triggerResizeEvent = triggerFunction;
+            visibilityChange.DEBUG_set_triggerResizeEvent(triggerFunction);
         }
     });
 
@@ -3127,7 +3129,7 @@ testModule('API', moduleConfig, () => {
         const instance = $element.dxOverlay({
             visible: true
         }).dxOverlay('instance');
-        const resizeStub = sinon.stub(visibilityChange, 'triggerResizeEvent');
+        const resizeStub = stubVisibilityEvent('triggerResizeEvent');
 
         instance.repaint();
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/popup.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/popup.tests.js
index 1fcb96b26eef..79a1ca867418 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/popup.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/popup.tests.js
@@ -23,7 +23,7 @@ import windowUtils from '__internal/core/utils/m_window';
 import uiErrors from 'ui/widget/ui.errors';
 import themes from 'ui/themes';
 import executeAsyncMock from '../../helpers/executeAsyncMock.js';
-import visibilityChangeUtils from 'common/core/events/visibility_change';
+import { spyVisibilityEvent } from '../../helpers/visibilityChangeMock.js';
 import domAdapter from '__internal/core/m_dom_adapter';
 import {
     TEMPLATE_WRAPPER_CLASS,
@@ -1532,7 +1532,7 @@ QUnit.module('options changed callbacks', {
 
     QUnit.module('T934380, T1245421', {
         beforeEach() {
-            this.resizeEventSpy = sinon.spy(visibilityChangeUtils, 'triggerResizeEvent');
+            this.resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
         },
         afterEach() {
             this.resizeEventSpy.restore();
@@ -1676,7 +1676,7 @@ QUnit.module('options changed callbacks', {
     QUnit.test('titleTemplate option change should trigger resize event for content correct geometry rendering', function(assert) {
         this.instance.option('visible', true);
 
-        const resizeEventSpy = sinon.spy(visibilityChangeUtils, 'triggerResizeEvent');
+        const resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
 
         try {
             this.instance.option({
@@ -1691,7 +1691,7 @@ QUnit.module('options changed callbacks', {
 
     QUnit.test('bottomTemplate option change should trigger resize event for content correct geometry rendering', function(assert) {
         this.instance.option('visible', true);
-        const resizeEventSpy = sinon.spy(visibilityChangeUtils, 'triggerResizeEvent');
+        const resizeEventSpy = spyVisibilityEvent('triggerResizeEvent');
 
         try {
             this.instance.option({
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/resizable.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/resizable.tests.js
index 688151935f87..3125bdcfe254 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/resizable.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/resizable.tests.js
@@ -1,5 +1,5 @@
 import translator from 'common/core/animation/translator';
-import visibilityChange from 'common/core/events/visibility_change';
+import * as visibilityChange from 'common/core/events/visibility_change';
 import $ from 'jquery';
 import 'ui/resizable';
 import pointerMock from '../../helpers/pointerMock.js';
@@ -1808,14 +1808,14 @@ QUnit.module('actions', () => {
         assert.expect(1);
 
         try {
-            visibilityChange.triggerResizeEvent = function() {
+            visibilityChange.DEBUG_set_triggerResizeEvent(function() {
                 assert.ok(true, 'event triggered');
-            };
+            });
 
             pointer.dragStart().drag(10, 0);
 
         } finally {
-            visibilityChange.triggerResizeEvent = triggerFunction;
+            visibilityChange.DEBUG_set_triggerResizeEvent(triggerFunction);
         }
     });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollView.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollView.tests.js
index a68329e45dd3..b6d6c37f0586 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollView.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollView.tests.js
@@ -3,6 +3,7 @@ import renderer from 'core/renderer';
 import { noop } from 'core/utils/common';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import devices from '__internal/core/m_devices';
 import eventsEngine from 'common/core/events/core/events_engine';
 import themes from 'ui/themes';
@@ -55,7 +56,7 @@ devices.current('iPhone');
 const moduleConfig = {
     beforeEach: function() {
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
         return new Promise((resolve) => themes.initialized(resolve));
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.actions.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.actions.tests.js
index c7f2f6363390..9d46c86faa86 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.actions.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.actions.tests.js
@@ -2,6 +2,7 @@ import $ from 'jquery';
 import { noop } from 'core/utils/common';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import pointerMock from '../../../helpers/pointerMock.js';
 
 import {
@@ -33,7 +34,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.dynamic.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.dynamic.tests.js
index 9979ac9fa302..4881f45ded04 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.dynamic.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.dynamic.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import resizeCallbacks from 'core/utils/resize_callbacks';
 import pointerMock from '../../../helpers/pointerMock.js';
 
@@ -33,7 +34,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
@@ -176,9 +177,9 @@ QUnit.test('gesture prevent when scrollable is full and bounce enabled false', f
 QUnit.test('stop inertia on click', function(assert) {
     assert.expect(1);
 
-    animationFrame.requestAnimationFrame = function(callback) {
+    animationFrame.DEBUG_set_requestAnimationFrame(function(callback) {
         setTimeout(callback, 0);
-    };
+    });
 
     const moveDistance = -10;
     const moveDuration = 10;
@@ -209,9 +210,9 @@ QUnit.test('stop inertia on click', function(assert) {
 QUnit.test('scrollbar is hidden on stop', function(assert) {
     assert.expect(1);
 
-    animationFrame.requestAnimationFrame = function(callback) {
+    animationFrame.DEBUG_set_requestAnimationFrame(function(callback) {
         setTimeout(callback, 0);
-    };
+    });
 
     const $scrollable = $('#scrollable').dxScrollable({
         showScrollbar: 'onScroll',
@@ -285,9 +286,9 @@ QUnit.test('bounce up', function(assert) {
 
     let scroll = 0;
 
-    animationFrame.requestAnimationFrame = function(callback) {
+    animationFrame.DEBUG_set_requestAnimationFrame(function(callback) {
         setTimeout(callback, 0);
-    };
+    });
 
     const $scrollable = $('#scrollable').dxScrollable({
         useNative: false,
@@ -313,9 +314,9 @@ QUnit.test('bounce up', function(assert) {
 QUnit.test('stop bounce on click', function(assert) {
     assert.expect(1);
 
-    animationFrame.requestAnimationFrame = function(callback) {
+    animationFrame.DEBUG_set_requestAnimationFrame(function(callback) {
         setTimeout(callback, 0);
-    };
+    });
 
     const moveDistance = -10;
     const moveDuration = 10;
@@ -346,9 +347,9 @@ QUnit.test('stop bounce on click', function(assert) {
 QUnit.test('stop inertia bounce on after mouse up', function(assert) {
     assert.expect(1);
 
-    animationFrame.requestAnimationFrame = function(callback) {
+    animationFrame.DEBUG_set_requestAnimationFrame(function(callback) {
         setTimeout(callback, 0);
-    };
+    });
 
     const moveDistance = -10;
     const moveDuration = 10;
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.main.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.main.tests.js
index 4c3b07c73706..983cde84a48c 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.main.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.main.tests.js
@@ -1,4 +1,5 @@
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import devices from '__internal/core/m_devices';
 import domUtils from '__internal/core/utils/m_dom';
@@ -42,7 +43,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.mouseWheel.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.mouseWheel.tests.js
index 91e41942b078..d5e054bba654 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.mouseWheel.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.mouseWheel.tests.js
@@ -1,5 +1,6 @@
 import $ from 'jquery';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import devices from '__internal/core/m_devices';
 import pointerMock from '../../../helpers/pointerMock.js';
 
@@ -33,7 +34,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.rtl.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.rtl.tests.js
index c1e98042c9d5..68bc0ca1cc08 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.rtl.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.rtl.tests.js
@@ -1,4 +1,5 @@
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import { triggerShownEvent } from 'common/core/events/visibility_change';
 import $ from 'jquery';
 import Scrollable from 'ui/scroll_view/ui.scrollable';
@@ -32,7 +33,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollbar.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollbar.tests.js
index 2fd827da508f..7a90a2f17912 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollbar.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollbar.tests.js
@@ -1,5 +1,6 @@
 import $ from 'jquery';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import devices from '__internal/core/m_devices';
 import Scrollbar from '__internal/ui/scroll_view/scrollbar';
 import pointerMock from '../../../helpers/pointerMock.js';
@@ -80,7 +81,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollingByThumb.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollingByThumb.tests.js
index 5d3a73a8fe38..e2b0547dab63 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollingByThumb.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.scrollingByThumb.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import Scrollbar from '__internal/ui/scroll_view/scrollbar';
 import pointerMock from '../../../helpers/pointerMock.js';
 
@@ -34,7 +35,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.useNative.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.useNative.tests.js
index 8744cc522027..43e425b55496 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.useNative.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/scrollableParts/scrollable.useNative.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import { getTranslateValues } from '__internal/ui/scroll_view/utils/get_translate_values';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import pointerMock from '../../../helpers/pointerMock.js';
 
 import {
@@ -33,7 +34,7 @@ const moduleConfig = {
         $('#qunit-fixture').html(markup);
 
         this.clock = sinon.useFakeTimers();
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
             callback();
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/sortable.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/sortable.tests.js
index 8013b9b0b350..780a1d32e7c2 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/sortable.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/sortable.tests.js
@@ -4,6 +4,7 @@ import 'ui/sortable';
 import 'ui/scroll_view';
 import fx from 'common/core/animation/fx';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import browser from 'core/utils/browser';
 import translator from 'common/core/animation/translator';
 import viewPort from 'core/utils/view_port';
@@ -2642,7 +2643,7 @@ function getModuleConfigForTestsWithScroll(elementSelector, scrollSelector) {
         beforeEach: function() {
             this.clock = sinon.useFakeTimers();
 
-            this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake((callback) => {
+            this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake((callback) => {
                 return window.setTimeout(callback, 10);
             });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.integration.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.integration.tests.js
index 3931e42d0ff3..f3b976cd4dae 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.integration.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.integration.tests.js
@@ -2,6 +2,7 @@ import $ from 'jquery';
 import { Renderer } from '../../helpers/vizMocks.js';
 import executeAsyncMock from '../../helpers/executeAsyncMock.js';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import legendModule from 'viz/components/legend';
 import titleModule from 'viz/core/title';
 import dxChart from 'viz/chart';
@@ -12,9 +13,7 @@ import seriesFamilyModule from 'viz/core/series_family';
 import { setupSeriesFamily } from '../../helpers/chartMocks.js';
 import pointerMock from '../../helpers/pointerMock.js';
 
-const mutableRendererModule = rendererModule.default ?? rendererModule;
-const mutableSeriesFamilyModule = seriesFamilyModule.default ?? seriesFamilyModule;
-const seriesFamilyNativeConstructor = mutableSeriesFamilyModule.SeriesFamily;
+const seriesFamilyNativeConstructor = seriesFamilyModule.SeriesFamily;
 setupSeriesFamily();
 QUnit.testStart(function() {
     const markup =
@@ -2327,7 +2326,7 @@ QUnit.test('check horizontal alignment === center', function(assert) {
 QUnit.module('Auto hide point markers', $.extend({}, moduleSetup, {
     beforeEach: function() {
         moduleSetup.beforeEach.call(this);
-        mutableSeriesFamilyModule.SeriesFamily = seriesFamilyNativeConstructor;
+        seriesFamilyModule.DEBUG_set_SeriesFamily(seriesFamilyNativeConstructor);
         const dataSource = [];
         for(let i = 0; i < 500000; i += 250) {
             const y1 = Math.sin(i);
@@ -3302,14 +3301,14 @@ QUnit.module('Option changing in onDrawn after zooming', {
     beforeEach: function() {
         this.legendShiftSpy = sinon.spy(legendModule.Legend.prototype, 'move');
         this.titleShiftSpy = sinon.spy(titleModule.Title.prototype, 'move');
-        sinon.stub(mutableRendererModule, 'Renderer').callsFake(function() {
+        stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
             return new Renderer();
         });
     },
     afterEach: function() {
         legendModule.Legend.prototype.move.restore();
         titleModule.Title.prototype.move.restore();
-        mutableRendererModule.Renderer.restore();
+        rendererModule.Renderer.restore();
     }
 });
 
@@ -4903,7 +4902,7 @@ QUnit.test('Reset axes animation before adjusting position of vertical axes (fix
 QUnit.module('SeriesFamily', $.extend({}, moduleSetup, {
     beforeEach: function() {
         moduleSetup.beforeEach.call(this);
-        mutableSeriesFamilyModule.SeriesFamily = seriesFamilyNativeConstructor;
+        seriesFamilyModule.DEBUG_set_SeriesFamily(seriesFamilyNativeConstructor);
     }
 }));
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part1.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part1.tests.js
index 98903e0642df..dd81141d23df 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part1.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part1.tests.js
@@ -19,7 +19,7 @@ import layoutManagerModule from 'viz/chart_components/layout_manager';
 import trackerModule from 'viz/chart_components/tracker';
 import dxChart from 'viz/chart';
 import resizeCallbacks from 'core/utils/resize_callbacks';
-import vizUtils from 'viz/core/utils';
+import vizUtils from 'viz/core/utils_default';
 import {
     MockSeries,
     seriesMockData,
@@ -951,10 +951,10 @@ QUnit.module('isReady', $.extend({}, environment, {
     beforeEach: function() {
         const that = this;
         environment.beforeEach.apply(this, arguments);
-        rendererModule.Renderer = sinon.spy(function(parameters) {
+        rendererModule.DEBUG_set_Renderer(sinon.spy(function(parameters) {
             that.renderer = new Renderer(parameters);
             return that.renderer;
-        });
+        }));
     },
     afterEach: function() {
         environment.afterEach.apply(this, arguments);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part2.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part2.tests.js
index 9cf6b8b5b947..8b834b77359a 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part2.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part2.tests.js
@@ -1,6 +1,6 @@
 import $ from 'jquery';
 import { environment } from './chartParts/commons.js';
-import vizUtils from 'viz/core/utils';
+import vizUtils from 'viz/core/utils_default';
 import {
     MockSeries,
     commonMethodsForTests,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part4.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part4.tests.js
index c8b435a2130d..f6a80c436a9e 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part4.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part4.tests.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import { environment, createChartInstance } from './chartParts/commons.js';
 import vizUtils from 'viz/core/utils_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import { MockSeries, commonMethodsForTests, categories, seriesMockData } from '../../helpers/chartMocks.js';
 
 $('<div id="chartContainer">').appendTo('#qunit-fixture');
@@ -276,7 +277,7 @@ QUnit.test('Create clipRects. With financial series', function(assert) {
     };
 
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
     const stubSeries = new MockSeries();
@@ -338,7 +339,7 @@ QUnit.test('Create clipRects. With series with errorBars', function(assert) {
     };
 
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
     const stubSeries = new MockSeries({
@@ -409,7 +410,7 @@ QUnit.test('Create clipRects. With financial series. Rotated', function(assert)
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
     const stubSeries = new MockSeries();
@@ -471,7 +472,7 @@ QUnit.test('Create clipRects. With financial series. Two panes', function(assert
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
         panes[1].canvas = rect;
     });
@@ -554,7 +555,7 @@ QUnit.test('Create clipRects. With financial series. For second panes', function
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
         panes[1].canvas = rect;
     });
@@ -646,7 +647,7 @@ QUnit.test('Create clipRects. With financial series. Two panes. Rotated', functi
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
         panes[1].canvas = rect;
     });
@@ -730,7 +731,7 @@ QUnit.test('Create clipRects. With financial series. For second panes. Rotated',
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
         panes[1].canvas = rect;
     });
@@ -842,7 +843,7 @@ QUnit.test('Update clipRects. With financial series', function(assert) {
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
 
@@ -958,7 +959,7 @@ QUnit.test('Update clipRects. With financial series. When start series does not
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
 
@@ -1049,7 +1050,7 @@ QUnit.test('Create clipRects with visible pane borders. With financial series',
         originalBottom: 70
     };
     vizUtils.updatePanesCanvases.restore();
-    sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+    stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
         panes[0].canvas = rect;
     });
     const stubSeries = new MockSeries();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part7.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part7.tests.js
index ea5cc7addabf..473f593472fe 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part7.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.part7.tests.js
@@ -15,6 +15,7 @@ import seriesModule from 'viz/series/base_series';
 import dataValidatorModule from 'viz/components/data_validator';
 import { MockSeries, categories, seriesMockData, MockTranslator } from '../../helpers/chartMocks.js';
 import graphicObjects from '__internal/common/charts';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const dxErrors = errorsWarnings.ERROR_MESSAGES;
 
@@ -71,7 +72,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
         const stubSeries = new MockSeries({});
 
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = this.createChart({
             series: {
@@ -86,7 +87,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
     QUnit.test('dxChart with single series, series type is unknown in option series', function(assert) {
         const stubSeries = new MockSeries({});
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = this.createChart({
             series: {
@@ -710,7 +711,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
             environment.afterEach.call(this);
         },
         mockValidateData: function() {
-            this.validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data) {
+            this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data) {
                 return { x: data || [] };
             });
         },
@@ -983,7 +984,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
         const stubSeries = new MockSeries({});
 
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = this.createChart({
             series: {
@@ -1005,7 +1006,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
         const stubSeries = new MockSeries({});
 
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = this.createChart({
             series: {
@@ -1027,7 +1028,7 @@ $('<div id="chartContainer">').appendTo('#qunit-fixture');
         const stubSeries = new MockSeries({});
 
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = createChartInstance({
             series: {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.tests.js
index 4cb701dc1d9d..b4cb60bd99d5 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chart.tests.js
@@ -5,6 +5,7 @@ import seriesModule from 'viz/series/base_series';
 import pointModule from 'viz/series/points/base_point';
 import axisModule from 'viz/axes/base_axis';
 import titleModule from 'viz/core/title';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import dataValidatorModule from 'viz/components/data_validator';
 import legendModule from 'viz/components/legend';
 import rangeModule from 'viz/translators/range';
@@ -45,7 +46,6 @@ const environment = {
         layoutManagerModule.LayoutManager.restore();
         seriesModule.Series.restore();
         pointModule.Point.restore();
-
         this.Title.restore();
         this.Legend.restore();
     },
@@ -64,12 +64,12 @@ const environment = {
         return chart;
     },
     _stubLayoutManager: function() {
-        this.LayoutManager = sinon.stub(layoutManagerModule, 'LayoutManager').callsFake(function() {
+        this.LayoutManager = stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager').callsFake(function() {
             return new LayoutManager(arguments);
         });
     },
     _stubLegend: function() {
-        this.Legend = sinon.stub(legendModule, 'Legend').callsFake(function() {
+        this.Legend = stubSeam(legendModule, 'Legend', '_setLegend').callsFake(function() {
             const legend = new Legend();
             legend.getTemplatesGroups = sinon.spy(function() {
                 return [];
@@ -81,12 +81,12 @@ const environment = {
         });
     },
     _stubTitle: function() {
-        this.Title = sinon.stub(titleModule, 'Title').callsFake(function() {
+        this.Title = stubSeam(titleModule, 'Title', 'DEBUG_set_title').callsFake(function() {
             return new ChartTitle();
         });
     },
     _stubAxis: function() {
-        this.Axis = sinon.stub(axisModule, 'Axis').callsFake(function() {
+        this.Axis = stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function() {
             const axis = new Axis();
             axis.updateOptions = sinon.spy(function(options) {
                 axis.name = options.name;
@@ -106,24 +106,24 @@ const environment = {
         });
     },
     _stubRange: function() {
-        sinon.stub(rangeModule, 'Range').callsFake(function(opt) {
+        stubSeam(rangeModule, 'Range', 'DEBUG_set_Range').callsFake(function(opt) {
             const range = new Range();
             $.extend(range, opt);
             return range;
         });
     },
     _stubSeriesAndPoint: function() {
-        sinon.stub(seriesModule, 'Series').callsFake(function() {
+        stubSeam(seriesModule, 'Series', 'DEBUG_set_Series').callsFake(function() {
             const series = new Series();
             return series;
         });
 
-        sinon.stub(pointModule, 'Point').callsFake(function() {
+        stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             return new Point();
         });
     },
     _stubValidateData: function() {
-        this.validateData = sinon.stub(dataValidatorModule, 'validateData');
+        this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData');
     },
     _restoreValidateData: function() {
         this.validateData.restore();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartAxisDrawing.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartAxisDrawing.tests.js
index bd3a9991fa33..cf1d64d104d5 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartAxisDrawing.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartAxisDrawing.tests.js
@@ -14,10 +14,11 @@ import titleModule from 'viz/core/title';
 import rendererModule from 'viz/core/renderers/renderer_default';
 import multiAxesSynchronizer from '__internal/viz/chart_components/multi_axes_synchronizer';
 import { Deferred } from 'core/utils/deferred';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const TitleOrig = titleModule.Title;
 
-rendererModule.Renderer = sinon.stub();
+rendererModule.DEBUG_set_Renderer(sinon.stub());
 
 const environment = {
     beforeEach: function() {
@@ -33,7 +34,7 @@ const environment = {
             getMargins: sinon.stub()
         };
 
-        this.scrollBarStub = sinon.stub(scrollBarModule, 'ScrollBar').callsFake(function(renderer, group) {
+        this.scrollBarStub = stubSeam(scrollBarModule, 'ScrollBar', 'DEBUG_set_ScrollBar').callsFake(function(renderer, group) {
             const scrollBar = new originalScrollBar(renderer, group);
             const originalUpdateSize = scrollBar.updateSize;
 
@@ -49,7 +50,7 @@ const environment = {
         let axisIndex = 0;
         const originalAxis = axisModule.Axis;
 
-        this.axisStub = sinon.stub(axisModule, 'Axis').callsFake(function(renderingSettings) {
+        this.axisStub = stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function(renderingSettings) {
             const axis = new originalAxis(renderingSettings);
 
             for(const stubName in axesStubs[axisIndex]) {
@@ -62,7 +63,7 @@ const environment = {
         this.title = new Title();
         this.legend = new Legend();
 
-        this.legendStub = sinon.stub(legendModule, 'Legend').callsFake(() =>{
+        this.legendStub = stubSeam(legendModule, 'Legend', '_setLegend').callsFake(() =>{
             this.legend.getTemplatesGroups = sinon.spy(function() {
                 return [];
             });
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartParts/commons.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartParts/commons.js
index da30309955ac..efc788fec0e6 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartParts/commons.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartParts/commons.js
@@ -32,6 +32,7 @@ import {
 } from '../../../helpers/chartMocks.js';
 import exportModule from '__internal/viz/core/exportModule';
 import { _test_prepareSegmentRectPoints } from 'viz/utils';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 
 const ThemeManager = stubClass(chartThemeManagerModule.ThemeManager);
 const LayoutManager = stubClass(layoutManagerModule.LayoutManager);
@@ -78,7 +79,7 @@ const defaultCrosshairOptions = {
 };
 
 // stubs
-sinon.stub(rendererModule, 'Renderer').callsFake((parameters) => {
+stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake((parameters) => {
     return new Renderer(parameters);
 });
 
@@ -89,7 +90,7 @@ titleModule.DEBUG_set_title(sinon.spy(function(parameters) {
     return title;
 }));
 
-sinon.stub(legendModule, 'Legend').callsFake((parameters) => {
+stubSeam(legendModule, 'Legend', '_setLegend').callsFake((parameters) => {
     const legend = new Legend(parameters);
     legend.getActionCallback = sinon.spy(function(arg) {
         return arg;
@@ -196,11 +197,11 @@ const environment = {
         that.layoutManager.layoutElements = sinon.spy(function() {
             arguments[2]();
         });
-        this.StubLayoutManager = sinon.stub(layoutManagerModule, 'LayoutManager').callsFake(function() {
+        this.StubLayoutManager = stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager').callsFake(function() {
             return that.layoutManager;
         });
 
-        sinon.stub(scrollBarClassModule, 'ScrollBar').callsFake(function() {
+        stubSeam(scrollBarClassModule, 'ScrollBar', 'DEBUG_set_ScrollBar').callsFake(function() {
             const ScrollBar = stubClass(ScrollBarClass);
             const scrollBar = new ScrollBar();
             scrollBar.stub('init').returns(scrollBar);
@@ -227,11 +228,11 @@ const environment = {
             }, options.argumentAxis));
             return createChartInstance(options, this.$container);
         };
-        this.createThemeManager = sinon.stub(chartThemeManagerModule, 'ThemeManager').callsFake(function() {
+        this.createThemeManager = stubSeam(chartThemeManagerModule, 'ThemeManager', 'DEBUG_set_ThemeManager').callsFake(function() {
             return that.themeManager;
         });
         const family = sinon.createStubInstance(seriesFamilyModule.SeriesFamily);
-        this.createSeriesFamily = sinon.stub(seriesFamilyModule, 'SeriesFamily').callsFake(function() {
+        this.createSeriesFamily = stubSeam(seriesFamilyModule, 'SeriesFamily', 'DEBUG_set_SeriesFamily').callsFake(function() {
             family.pane = 'default';
             family.adjustSeriesDimensions = sinon.stub();
             family.adjustSeriesValues = sinon.stub();
@@ -239,14 +240,14 @@ const environment = {
             return family;
         });
         this.prepareSegmentRectPoints = _test_prepareSegmentRectPoints(function(x, y, w, h, borderOptions) { return { points: [x, y, w, h], pathType: borderOptions }; });
-        this.createCrosshair = sinon.stub(crosshairModule, 'Crosshair').callsFake(function() {
+        this.createCrosshair = stubSeam(crosshairModule, 'Crosshair', 'DEBUG_set_Crosshair').callsFake(function() {
             return sinon.createStubInstance(Crosshair);
         });
 
         tooltipModule.DEBUG_set_tooltip(sinon.spy(function(parameters) {
             return that.tooltip;
         }));
-        sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes, canvas) {
+        stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes, canvas) {
             $.each(panes, function(_, item) {
                 item.canvas = $.extend({}, canvas);
             });
@@ -287,7 +288,7 @@ const environment = {
         tooltipModule.DEBUG_set_tooltip(null);
     },
     mockValidateData: function() {
-        this.validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data, groupsData) {
+        this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data, groupsData) {
             const categories = [];
             if(data) {
                 data.forEach(function(item) {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartSync.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartSync.tests.js
index bb388fa2dc37..378810dedb48 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/chartSync.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/chartSync.tests.js
@@ -19,6 +19,7 @@ import { CustomStore } from 'common/data/custom_store';
 import chartThemeManagerModule from 'viz/components/chart_theme_manager';
 import scrollBarModule from 'viz/chart_components/scroll_bar';
 import dxChart from 'viz/chart';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import {
     MockSeries,
     MockPoint,
@@ -37,9 +38,9 @@ const ScrollBar = scrollBarModule.ScrollBar;
 $('<div id="chartContainer">').appendTo('#qunit-fixture');
 setupSeriesFamily();
 
-rendererModule.Renderer = function(parameters) {
+rendererModule.DEBUG_set_Renderer(function(parameters) {
     return new Renderer(parameters);
-};
+});
 
 const defaultCrosshairOptions = {
     horizontalLine: {},
@@ -63,7 +64,7 @@ exportModule.DEBUG_set_ExportMenu(sinon.spy(function() {
     return new ExportMenu();
 }));
 
-legendModule.Legend = sinon.spy(function(parameters) {
+legendModule._setLegend(sinon.spy(function(parameters) {
     const legend = new Legend(parameters);
     legend.update = sinon.spy(function(params, settings) {
         legend.getPosition = sinon.stub().returns(settings.position);
@@ -82,7 +83,7 @@ legendModule.Legend = sinon.spy(function(parameters) {
         return [];
     });
     return legend;
-});
+}));
 
 function getLegendStub() {
     return legendModule.Legend.lastCall.returnValue;
@@ -118,13 +119,13 @@ const environment = {
         that.themeManager.getOptions.withArgs('resolveLabelOverlapping').returns(false);
         that.themeManager.getOptions.returns({});
 
-        titleModule.Title = sinon.spy(function(parameters) {
+        titleModule.DEBUG_set_title(sinon.spy(function(parameters) {
             const title = new Title(parameters);
             title.getLayoutOptions = sinon.stub().returns({
                 verticalAlignment: that.titleVerticalAlignment || 'bottom'
             });
             return title;
-        });
+        }));
 
         that.createChart = function(options) {
             options = $.extend(true, {
@@ -145,7 +146,7 @@ const environment = {
             return createChartInstance(options, this.$container);
         };
 
-        this.createThemeManager = sinon.stub(chartThemeManagerModule, 'ThemeManager').callsFake(function() {
+        this.createThemeManager = stubSeam(chartThemeManagerModule, 'ThemeManager', 'DEBUG_set_ThemeManager').callsFake(function() {
             return that.themeManager;
         });
         this.layoutManager = new LayoutManager();
@@ -153,7 +154,7 @@ const environment = {
             arguments[2] && arguments[2]();
         });
 
-        sinon.stub(layoutManagerModule, 'LayoutManager').callsFake(function() {
+        stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager').callsFake(function() {
             const layoutManager = new LayoutManager();
             layoutManager
                 .stub('needMoreSpaceForPanesCanvas')
@@ -166,17 +167,17 @@ const environment = {
             return layoutManager;
         });
 
-        sinon.stub(tooltipModule, 'Tooltip').callsFake(function(parameters) {
+        stubSeam(tooltipModule, 'Tooltip', 'DEBUG_set_tooltip').callsFake(function(parameters) {
             return new StubTooltip(parameters);
         });
 
-        sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes, canvas) {
+        stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes, canvas) {
             $.each(panes, function(_, item) {
                 item.canvas = $.extend({}, canvas);
             });
         });
 
-        validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data) {
+        validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data) {
             return { arg: data || [] };
         });
     },
@@ -219,7 +220,7 @@ const environment = {
         const spyLayoutManager = layoutManagerModule.LayoutManager;
 
         vizUtils.updatePanesCanvases.restore();
-        sinon.stub(vizUtils, 'updatePanesCanvases').callsFake(function(panes) {
+        stubSeam(vizUtils, 'updatePanesCanvases', 'DEBUG_set_updatePanesCanvases').callsFake(function(panes) {
             panes[0].canvas = rect;
         });
 
@@ -674,7 +675,7 @@ const environment = {
     });
 
     QUnit.test('draw chart when scrollBar is visible', function(assert) {
-        sinon.stub(scrollBarModule, 'ScrollBar').callsFake(function() {
+        stubSeam(scrollBarModule, 'ScrollBar', 'DEBUG_set_ScrollBar').callsFake(function() {
             const stub = sinon.createStubInstance(ScrollBar);
             stub.init.returns(stub);
             stub.update.returns(stub);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/charts.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/charts.tests.js
index a2a66750d1db..55ee38c98908 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/charts.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/charts.tests.js
@@ -1,11 +1,11 @@
 import testGlobalExports from '../../helpers/publicModulesHelper.js';
 import * as AdvancedChartModule from '__internal/viz/chart_components/advanced_chart';
 import * as baseChartModule from '__internal/viz/chart_components/base_chart';
-import * as CrosshairModule from 'viz/chart_components/crosshair';
-import * as LayoutManagerModule from 'viz/chart_components/layout_manager';
+import CrosshairModule from 'viz/chart_components/crosshair';
+import LayoutManagerModule from 'viz/chart_components/layout_manager';
 import multiAxesSynchronizer from '__internal/viz/chart_components/multi_axes_synchronizer';
-import * as ScrollBarModule from 'viz/chart_components/scroll_bar';
-import * as trackerModule from 'viz/chart_components/tracker';
+import ScrollBarModule from 'viz/chart_components/scroll_bar';
+import trackerModule from 'viz/chart_components/tracker';
 
 import 'viz/chart';
 import 'viz/pie_chart';
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/equalPieSize.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/equalPieSize.tests.js
index 68bbc7ed15e0..0241bd8d3782 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/equalPieSize.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/equalPieSize.tests.js
@@ -6,6 +6,7 @@ import layoutManagerModule from 'viz/chart_components/layout_manager';
 import dxPieChart from 'viz/pie_chart';
 import { MockSeries, MockPoint, insertMockFactory, restoreMockFactory, resetMockFactory, seriesMockData } from '../../helpers/chartMocks.js';
 import { rendererModule, resetModules } from './chartParts/commons.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 function getContainer(hidden) {
     const div = $('<div>').appendTo('#qunit-fixture');
@@ -60,18 +61,18 @@ const dataSourceTemplate = [
     { cat: 'Third', val: 300 }
 ];
 
-rendererModule.Renderer = sinon.spy(function(parameters) {
+rendererModule.DEBUG_set_Renderer(sinon.spy(function(parameters) {
     return new Renderer(parameters);
-});
+}));
 
 const environment = {
     beforeEach: function() {
         setupMocks.call(this);
 
         this.originalLayoutManagerCtor = layoutManagerModule.LayoutManager;
-        this.LayoutManager = sinon.stub(layoutManagerModule, 'LayoutManager');
+        this.LayoutManager = stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager');
 
-        this.validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data) {
+        this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data) {
             return { arg: data || [] };
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/pieChart.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/pieChart.tests.js
index 5678d675a517..a32866de372b 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/pieChart.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/pieChart.tests.js
@@ -19,7 +19,7 @@ import {
 import exportModule from '__internal/viz/core/exportModule';
 import seriesModule from 'viz/series/base_series';
 import { BaseChart } from '__internal/viz/chart_components/base_chart';
-import * as labelModule from 'viz/series/points/label';
+import labelModule from 'viz/series/points/label';
 import dataValidatorModule from 'viz/components/data_validator';
 import translator1DModule from 'viz/translators/translator1d';
 import { CustomStore } from 'common/data/custom_store';
@@ -35,6 +35,7 @@ import TemplateManagerModule from '__internal/core/m_template_manager';
 import graphicObjects from '__internal/common/charts';
 import eventsEngine from 'common/core/events/core/events_engine';
 import devices from '__internal/core/m_devices';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const LabelCtor = new ObjectPool(labelModule.Label);
 
@@ -46,9 +47,9 @@ const dataSourceTemplate = [
     { cat: 'Third', val: 300 }
 ];
 
-rendererModule.Renderer = sinon.spy(function(parameters) {
+rendererModule.DEBUG_set_Renderer(sinon.spy(function(parameters) {
     return new Renderer(parameters);
-});
+}));
 
 function createPieChart(options) {
     this.container = $('#chartContainer');
@@ -168,14 +169,14 @@ const environment = {
         that.layoutManager.needMoreSpaceForPanesCanvas.returns(true);
         that.layoutManager.applyPieChartSeriesLayout.returns({ radiusInner: 0, radiusOuter: 300, centerX: 100, centerY: 200 });
 
-        that.LayoutManager = sinon.stub(layoutManagerModule, 'LayoutManager').callsFake(function() {
+        that.LayoutManager = stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager').callsFake(function() {
             return that.layoutManager;
         });
 
-        this.createThemeManager = sinon.stub(chartThemeManagerModule, 'ThemeManager').callsFake(function() {
+        this.createThemeManager = stubSeam(chartThemeManagerModule, 'ThemeManager', 'DEBUG_set_ThemeManager').callsFake(function() {
             return that.themeManager;
         });
-        this.validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data) {
+        this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data) {
             return { arg: data || [] };
         });
     },
@@ -717,7 +718,7 @@ const overlappingEnvironment = $.extend({}, environment, {
     QUnit.test('dxChart with single series, series type is unknown', function(assert) {
         const stubSeries = new MockSeries({});
         seriesMockData.series.push(stubSeries);
-        seriesModule.Series = function() { return { isUpdated: false }; };
+        seriesModule.DEBUG_set_Series(function() { return { isUpdated: false }; });
 
         const chart = this.createPieChart({
             dataSource: dataSourceTemplate,
@@ -832,7 +833,7 @@ const overlappingEnvironment = $.extend({}, environment, {
             environment.beforeEach.apply(this, arguments);
             const translatorClass = new stubClass(translator1DModule.Translator1D);
 
-            sinon.stub(translator1DModule, 'Translator1D').callsFake(function() {
+            stubSeam(translator1DModule, 'Translator1D', 'DEBUG_set_Translator1D').callsFake(function() {
                 const translator = new translatorClass();
                 translator.stub('setDomain').returnsThis();
                 translator.stub('setCodomain').returnsThis();
@@ -891,7 +892,7 @@ const overlappingEnvironment = $.extend({}, environment, {
 
             const translatorClass = new stubClass(translator1DModule.Translator1D);
 
-            sinon.stub(translator1DModule, 'Translator1D').callsFake(function() {
+            stubSeam(translator1DModule, 'Translator1D', 'DEBUG_set_Translator1D').callsFake(function() {
                 const translator = new translatorClass();
                 translator.stub('setDomain').returnsThis();
                 translator.stub('setCodomain').returnsThis();
@@ -1073,7 +1074,7 @@ const overlappingEnvironment = $.extend({}, environment, {
             this.mockSeries2 = new MockSeries({ argumentField: 'arg' });
             const translatorClass = new stubClass(translator1DModule.Translator1D);
 
-            sinon.stub(translator1DModule, 'Translator1D').callsFake(function() {
+            stubSeam(translator1DModule, 'Translator1D', 'DEBUG_set_Translator1D').callsFake(function() {
                 const translator = new translatorClass();
                 translator.stub('setDomain').returnsThis();
                 translator.stub('setCodomain').returnsThis();
@@ -2046,7 +2047,7 @@ const overlappingEnvironment = $.extend({}, environment, {
 
             const translatorClass = new stubClass(translator1DModule.Translator1D);
 
-            sinon.stub(translator1DModule, 'Translator1D').callsFake(function() {
+            stubSeam(translator1DModule, 'Translator1D', 'DEBUG_set_Translator1D').callsFake(function() {
                 const translator = new translatorClass();
                 translator.stub('setDomain').returnsThis();
                 translator.stub('setCodomain').returnsThis();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/polarChart.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/polarChart.tests.js
index e947b5b328dc..f66a6fc6528f 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/polarChart.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/polarChart.tests.js
@@ -17,6 +17,7 @@ import layoutManagerModule from 'viz/chart_components/layout_manager';
 import exportModule from '__internal/viz/core/exportModule';
 
 import 'viz/chart';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const { Series } = seriesModule;
 
@@ -32,7 +33,7 @@ QUnit.testStart(function() {
     chartContainer.appendTo('#qunit-fixture');
 });
 
-legendModule.Legend = sinon.spy(function(parameters) {
+legendModule._setLegend(sinon.spy(function(parameters) {
     const legend = new Legend(parameters);
     legend.getActionCallback = sinon.spy(function(arg) {
         return arg;
@@ -44,7 +45,7 @@ legendModule.Legend = sinon.spy(function(parameters) {
         return [];
     });
     return legend;
-});
+}));
 
 function stubExport() {
     const exportMenuInstance = new ExportMenu();
@@ -152,7 +153,7 @@ const environment = {
 
         that.$container = $('#chartContainer');
 
-        this.createThemeManager = sinon.stub(chartThemeManagerModule, 'ThemeManager').callsFake(function() {
+        this.createThemeManager = stubSeam(chartThemeManagerModule, 'ThemeManager', 'DEBUG_set_ThemeManager').callsFake(function() {
             resetStub(stubThemeManager);
             that.themeManager = stubThemeManager;
             return stubThemeManager;
@@ -169,25 +170,25 @@ const environment = {
             };
         };
 
-        that.createRenderer = sinon.stub(rendererModule, 'Renderer').callsFake(function() {
+        that.createRenderer = stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
             const stubRenderer = new Renderer();
             stubRenderer.clipCircle = that.clipFunc;
             stubRenderer.clipRect = that.clipFunc;
             return stubRenderer;
         });
 
-        that.createTooltip = sinon.stub(tooltipModule, 'Tooltip').callsFake(function() {
+        that.createTooltip = stubSeam(tooltipModule, 'Tooltip', 'DEBUG_set_tooltip').callsFake(function() {
             resetStub(stubTooltip);
             return stubTooltip;
         });
 
-        that.range = sinon.stub(rangeModule, 'Range').callsFake(function() {
+        that.range = stubSeam(rangeModule, 'Range', 'DEBUG_set_Range').callsFake(function() {
             resetStub(stubRange);
             stubRange.addRange = function() { this.min = 2; };
             return stubRange;
         });
 
-        that.createSeries = sinon.stub(seriesModule, 'Series').callsFake(function(settings, seriesTheme) {
+        that.createSeries = stubSeam(seriesModule, 'Series', 'DEBUG_set_Series').callsFake(function(settings, seriesTheme) {
             resetStub(stubSeries[seriesIndex]);
             stubSeries[seriesIndex].getValueAxis.returns(settings.valueAxis);
             if(seriesTheme.valueErrorBar) {
@@ -196,7 +197,7 @@ const environment = {
             return $.extend(true, stubSeries[seriesIndex++], seriesTheme);
         });
 
-        that.createAxis = sinon.stub(axisModule, 'Axis').callsFake(function() {
+        that.createAxis = stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function() {
             resetStub(stubAxes[axesIndex]);
 
             stubAxes[axesIndex].getMargins.returns({
@@ -209,12 +210,12 @@ const environment = {
             return stubAxes[axesIndex++];
         });
 
-        that.createSeriesFamily = sinon.stub(seriesFamilyModule, 'SeriesFamily').callsFake(function() {
+        that.createSeriesFamily = stubSeam(seriesFamilyModule, 'SeriesFamily', 'DEBUG_set_SeriesFamily').callsFake(function() {
             resetStub(stubSeriesFamily);
             return stubSeriesFamily;
         });
 
-        that.createLayoutManager = sinon.stub(layoutManagerModule, 'LayoutManager').callsFake(function() {
+        that.createLayoutManager = stubSeam(layoutManagerModule, 'LayoutManager', 'DEBUG_set_LayoutManager').callsFake(function() {
             resetStub(stubLayoutManager);
             return stubLayoutManager;
         });
@@ -345,7 +346,7 @@ QUnit.test('create series with panes', function(assert) {
 });
 
 QUnit.test('give series in groups to data validator', function(assert) {
-    const validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function(data) {
+    const validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function(data) {
         return data || [];
     });
     try {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.charts/scrollBar.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.charts/scrollBar.tests.js
index 5233d0a2ba6e..70b8554fbb65 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.charts/scrollBar.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.charts/scrollBar.tests.js
@@ -8,6 +8,7 @@ import { ScrollBar } from 'viz/chart_components/scroll_bar';
 import translator2DModule from 'viz/translators/translator2d';
 import pointerMock from '../../helpers/pointerMock.js';
 import dragEvents from 'common/core/events/drag';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Translator = stubClass(translator2DModule.Translator2D);
 
@@ -34,7 +35,7 @@ const environment = {
 
         this.group = this.renderer.g();
 
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             const stub = new Translator();
             stub.getScale = sinon.stub().returns(1);
             stub.stub('getCanvasVisibleArea');
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/areaSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/areaSeries.tests.js
index 7c44e7490fee..d0347e0f12f2 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/areaSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/areaSeries.tests.js
@@ -4,6 +4,7 @@ import {
 } from '../../helpers/vizMocks.js';
 import { noop } from 'core/utils/common';
 import vizUtils from 'viz/core/utils_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import { insertMockFactory, MockAxis, restoreMockFactory } from '../../helpers/chartMocks.js';
@@ -99,7 +100,7 @@ const environmentWithSinonStubPoint = {
     beforeEach: function() {
         environment.beforeEach.call(this);
         let mockPointIndex = 0;
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(series, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series, data) {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.angle = -data.argument;
@@ -3059,7 +3060,7 @@ function setDiscreteType(series) {
     QUnit.module('Polar Series', {
         beforeEach: function() {
             environmentWithSinonStubPoint.beforeEach.call(this);
-            sinon.stub(vizUtils, 'getCosAndSin');
+            stubSeam(vizUtils, 'getCosAndSin', 'DEBUG_set_getCosAndSin');
             vizUtils.getCosAndSin.returns({ cos: 1, sin: -1 });
         },
         afterEach: function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/barPoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/barPoint.tests.js
index 5298fb48ac87..0c9fc618952f 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/barPoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/barPoint.tests.js
@@ -76,14 +76,15 @@ const environment = {
         };
 
         this.label = sinon.createStubInstance(labelModule.Label);
-        this.labelFactory = labelModule.Label = sinon.spy(function() {
+        this.labelFactory = sinon.spy(function() {
             return that.label;
         });
+        labelModule.DEBUG_set_Label(this.labelFactory);
         this.label.getLayoutOptions.returns(this.options.label);
         this.label.getBoundingRect.returns({ height: 10, width: 20 });
     },
     afterEach: function() {
-        labelModule.Label = originalLabel;
+        labelModule.DEBUG_set_Label(originalLabel);
     }
 };
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/barSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/barSeries.tests.js
index e2cf41d7b953..a1c67c6d1460 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/barSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/barSeries.tests.js
@@ -6,6 +6,7 @@ import Color from 'color';
 import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import { MockAxis, MockTranslator } from '../../helpers/chartMocks.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -67,7 +68,7 @@ const environment = {
         this.renderer = new Renderer();
         this.seriesGroup = this.renderer.g();
         this.data = [{ arg: 1, val: 10 }, { arg: 2, val: 20 }, { arg: 3, val: 30 }, { arg: 4, val: 40 }];
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.getMarkerCoords.returns({ x: 1, y: 2, width: 20, height: 10 });
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/basePoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/basePoint.tests.js
index 986b07c4157f..20e5543b98da 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/basePoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/basePoint.tests.js
@@ -6,6 +6,7 @@ import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import SeriesModule from 'viz/series/base_series';
 import { MockTranslator } from '../../helpers/chartMocks.js';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -540,7 +541,7 @@ QUnit.module('Draw', {
             attributes: { r: 6 },
             symbol: 'circle'
         };
-        this.sinonFactory = sinon.stub(labelModule, 'Label').callsFake(function() {
+        this.sinonFactory = stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             return sinon.createStubInstance(originalLabel);
         });
         this.series = {
@@ -606,7 +607,7 @@ QUnit.module('Label', {
         this.renderer = new Renderer();
         this.group = this.renderer.g();
 
-        this.sinonFactory = sinon.stub(labelModule, 'Label').callsFake(function() {
+        this.sinonFactory = stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             return sinon.createStubInstance(originalLabel);
         });
         this.labelsGroup = {};
@@ -1244,7 +1245,7 @@ QUnit.module('Dispose', {
             attributes: { r: 6 },
             symbol: 'circle'
         };
-        this.sinonFactory = sinon.stub(labelModule, 'Label').callsFake(function() {
+        this.sinonFactory = stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             return sinon.createStubInstance(originalLabel);
         });
         this.series = {
@@ -1355,7 +1356,7 @@ QUnit.module('API', {
             _argumentChecker: function() { return true; },
             _valueChecker: function() { return true; }
         };
-        sinon.spy(labelModule, 'Label');
+        spySeam(labelModule, 'Label', 'DEBUG_set_Label');
     },
     afterEach: function() {
         labelModule.Label.restore();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/baseSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/baseSeries.tests.js
index 65621c4d4211..90892b53c9ca 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/baseSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/baseSeries.tests.js
@@ -8,6 +8,7 @@ import typeUtils from 'core/utils/type';
 import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import { insertMockFactory, MockTranslator, MockAxis, restoreMockFactory } from '../../helpers/chartMocks.js';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 const mixins = SeriesModule.mixins;
@@ -67,12 +68,12 @@ const environment = {
 
         this.renderer = new Renderer();
         _this.realCreatePoint = pointModule.Point;
-        pointModule.Point = function() {
+        pointModule.DEBUG_set_Point(function() {
             _this.pointsCreatingCount++;
             const point = _this.realCreatePoint.apply(null, arguments);
             point.setInvisibility = sinon.stub();
             return point;
-        };
+        });
 
         chartSeriesNS['mocktype'] = {
             stylesHistory: [],
@@ -160,7 +161,7 @@ const environment = {
         mixins.pie['mocktype'] = mixins.chart['mocktype'];
     },
     afterEach: function() {
-        pointModule.Point = this.realCreatePoint;
+        pointModule.DEBUG_set_Point(this.realCreatePoint);
         restoreMockFactory();
     }
 };
@@ -178,7 +179,7 @@ const environmentWithSinonStubPoint = {
     beforeEach: function() {
         environment.beforeEach.call(this);
         let mockPointIndex = 0;
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(series, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series, data) {
             const stub = mockPoints[mockPointIndex++];
             stub.series = series;
             stub.argument = data.argument || 1;
@@ -794,7 +795,7 @@ QUnit.test('Pass errorBars options to point (on update). ErrorBars are visible',
 
 QUnit.module('tag to points', {
     beforeEach: function() {
-        this.spy = sinon.spy(pointModule, 'Point');
+        this.spy = spySeam(pointModule, 'Point', 'DEBUG_set_Point');
         this.data = [{ arg: 1, val: 1 }, { arg: 2, val: 2 }, { arg: 3, val: 3 }];
     },
     afterEach: function() {
@@ -2183,7 +2184,7 @@ QUnit.test('Points count > maxLabelCount', function(assert) {
 QUnit.module('Series states - excludePointsMode', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = sinon.createStubInstance(originalPoint);
             stub.argument = 1;
             stub.hasValue.returns(true);
@@ -2551,7 +2552,7 @@ QUnit.test('setHoverState after Selected State in includePointsMode', function(a
 QUnit.module('Series states - nearestPoint Mode', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(_, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(_, data) {
             const stub = sinon.createStubInstance(originalPoint);
             stub.argument = 1;
 
@@ -2910,7 +2911,7 @@ QUnit.test('reset nearest point on select', function(assert) {
 QUnit.module('Series states - includePointsMode', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = sinon.createStubInstance(originalPoint);
             stub.argument = 1;
             stub.hasValue.returns(true);
@@ -3269,7 +3270,7 @@ QUnit.test('clear selection hovered', function(assert) {
 QUnit.module('Series states - none mode', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = sinon.createStubInstance(originalPoint);
             stub.argument = 1;
             stub.hasValue.returns(true);
@@ -4877,7 +4878,7 @@ QUnit.module('Legend states', {
     beforeEach: function() {
         this.legendCallback = sinon.stub();
         environment.beforeEach.call(this);
-        sinon.stub(pointModule, 'Point').callsFake(function(series) {
+        stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series) {
             const point = new Point();
             point.argument = 1;
             point.series = series;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubblePoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubblePoint.tests.js
index 85ff6594fec9..43f0abdb54b5 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubblePoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubblePoint.tests.js
@@ -344,14 +344,15 @@ QUnit.module('Draw Label', {
             _valueChecker: function() { return true; }
         };
         this.label = sinon.createStubInstance(labelModule.Label);
-        this.labelFactory = labelModule.Label = sinon.spy(function() {
+        this.labelFactory = sinon.spy(function() {
             return that.label;
         });
+        labelModule.DEBUG_set_Label(this.labelFactory);
         this.label.getLayoutOptions.returns(this.options.label);
         this.label.getBoundingRect.returns({ height: 10, width: 20 });
     },
     afterEach: function() {
-        labelModule.Label = originalLabel;
+        labelModule.DEBUG_set_Label(originalLabel);
     }
 });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubbleSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubbleSeries.tests.js
index 7fee08d47f4d..4b608fd0ae54 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubbleSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/bubbleSeries.tests.js
@@ -6,6 +6,7 @@ import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 const Series = SeriesModule.Series;
 import { MockAxis, insertMockFactory, restoreMockFactory } from '../../helpers/chartMocks.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const createSeries = function(options, renderSettings) {
     renderSettings = renderSettings || {};
@@ -66,7 +67,7 @@ const environment = {
         this.seriesGroup = this.renderer.g();
         this.data = [{ arg: 1, val: 10, size: 1 }, { arg: 2, val: 20, size: 1 }, { arg: 3, val: 30, size: 1 }, { arg: 4, val: 40, size: 1 }];
 
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.hasValue.returns(true);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialPoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialPoint.tests.js
index b4d7fac27d4a..1ec80f003e77 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialPoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialPoint.tests.js
@@ -6,6 +6,7 @@ import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import { MockTranslator, MockSeries } from '../../helpers/chartMocks.js';
 import tooltipModule from 'viz/core/tooltip';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const originalLabel = labelModule.Label;
 
@@ -1761,7 +1762,7 @@ QUnit.module('Draw label', {
                 failOnWrongData: true
             })
         };
-        this.sinonFactory = sinon.stub(labelModule, 'Label').callsFake(function() {
+        this.sinonFactory = stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             const label = sinon.createStubInstance(originalLabel);
             label.getLayoutOptions.returns(that.options.label);
             label.getBoundingRect.returns({ height: 10, width: 20 });
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialSeries.tests.js
index 8000b8eeaadc..f4276f83161d 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/financialSeries.tests.js
@@ -5,6 +5,7 @@ import {
 import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import { MockAxis, insertMockFactory, restoreMockFactory } from '../../helpers/chartMocks.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -29,7 +30,7 @@ const environment = {
         this.data = [
             { date: 'arg1', high: 'high1', low: 'low1', open: 'open1', close: 'close1' }
         ];
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.hasValue.returns(true);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/lineSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/lineSeries.tests.js
index e1b096619b24..82656c4556e3 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/lineSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/lineSeries.tests.js
@@ -4,6 +4,7 @@ import {
 } from '../../helpers/vizMocks.js';
 import { noop } from 'core/utils/common';
 import vizUtils from 'viz/core/utils_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import {
@@ -78,7 +79,7 @@ const environmentWithSinonStubPoint = {
         environment.beforeEach.call(this);
         let mockPointIndex = 0;
 
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(series, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series, data) {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.angle = -data.argument;
@@ -1350,7 +1351,7 @@ function setDiscreteType(series) {
             this.options = {
                 type: 'line'
             };
-            this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+            this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
                 const stub = sinon.createStubInstance(originalPoint);
                 stub.argument = 1;
                 stub.hasValue.returns(true);
@@ -2277,7 +2278,7 @@ function setDiscreteType(series) {
     QUnit.module('polar Series', {
         beforeEach: function() {
             environmentWithSinonStubPoint.beforeEach.call(this);
-            sinon.stub(vizUtils, 'getCosAndSin');
+            stubSeam(vizUtils, 'getCosAndSin', 'DEBUG_set_getCosAndSin');
             vizUtils.getCosAndSin.returns({ cos: 1, sin: -1 });
         },
         afterEach: function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/piePoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/piePoint.tests.js
index 31b8f88887f6..960879cfd04d 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/piePoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/piePoint.tests.js
@@ -1348,12 +1348,13 @@ QUnit.module('Connector', {
         this.label = sinon.createStubInstance(labelModule.Label);
         this.label.getLayoutOptions.returns(this.options.label);
         this.label.getBoundingRect.returns({ height: 10, width: 20 });
-        this.labelFactory = labelModule.Label = sinon.spy(function() {
+        this.labelFactory = sinon.spy(function() {
             return that.label;
         });
+        labelModule.DEBUG_set_Label(this.labelFactory);
     },
     afterEach: function() {
-        labelModule.Label = originalLabel;
+        labelModule.DEBUG_set_Label(originalLabel);
     }
 });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/pieSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/pieSeries.tests.js
index 8fc75f54cf79..585a858f3a20 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/pieSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/pieSeries.tests.js
@@ -6,6 +6,7 @@ import { noop } from 'core/utils/common';
 import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import SeriesModule from 'viz/series/base_series';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -78,7 +79,7 @@ const environment = {
     beforeEach: function() {
         this.data = [{ arg: 1, val: 10 }, { arg: 2, val: 20 }, { arg: 3, val: 30 }, { arg: 4, val: 40 }];
         let mockPointIndex = 0;
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(series, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series, data) {
             const stub = mockPoints[mockPointIndex++];
 
             stub.argument = data.argument || 1;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/polarPoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/polarPoint.tests.js
index e6cbb4c97fd5..00459e50d36b 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/polarPoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/polarPoint.tests.js
@@ -5,6 +5,7 @@ import {
 import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import SeriesModule from 'viz/series/base_series';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -61,7 +62,7 @@ const environment = {
         series._argumentChecker.returns(true);
         series._valueChecker.returns(true);
 
-        this.createLabel = sinon.stub(labelModule, 'Label').callsFake(function() {
+        this.createLabel = stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             label.getBoundingRect.returns({ x: 1, y: 2, width: 20, height: 10 });
             label.getLayoutOptions.returns({ alignment: 'center', radialOffset: 0 });
             resetStub(label);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangePoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangePoint.tests.js
index 434d377fb08a..54ad00fca54f 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangePoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangePoint.tests.js
@@ -7,6 +7,7 @@ import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import { MockTranslator, MockAxis } from '../../helpers/chartMocks.js';
 import tooltipModule from 'viz/core/tooltip';
+import { spySeam } from '../../helpers/moduleSeam.js';
 
 const originalLabel = labelModule.Label;
 
@@ -71,12 +72,13 @@ const environment = {
                 attributes: {}
             }
         };
-        this.labelFactory = labelModule.Label = sinon.spy(function() {
+        this.labelFactory = sinon.spy(function() {
             const label = sinon.createStubInstance(originalLabel);
             label.getLayoutOptions.returns(that.options.label);
             label.getBoundingRect.returns({ height: 10, width: 20 });
             return label;
         });
+        labelModule.DEBUG_set_Label(this.labelFactory);
         this.series = {
             name: 'series',
             _labelsGroup: {},
@@ -92,7 +94,7 @@ const environment = {
         };
     },
     afterEach: function() {
-        labelModule.Label = originalLabel;
+        labelModule.DEBUG_set_Label(originalLabel);
     }
 };
 
@@ -2129,7 +2131,7 @@ QUnit.module('API', {
             _argumentChecker: function() { return true; },
             _valueChecker: function() { return true; }
         };
-        sinon.spy(labelModule, 'Label');
+        spySeam(labelModule, 'Label', 'DEBUG_set_Label');
 
         this.translators = {
             arg: new MockTranslator({
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangeSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangeSeries.tests.js
index 6423c169a150..23ea6787513b 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangeSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/rangeSeries.tests.js
@@ -6,6 +6,7 @@ import pointModule from 'viz/series/points/base_point';
 import SeriesModule from 'viz/series/base_series';
 import { MockAxis, insertMockFactory, restoreMockFactory } from '../../helpers/chartMocks.js';
 import { noop } from 'core/utils/common';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -79,7 +80,7 @@ const environmentWithSinonStubPoint = {
     beforeEach: function() {
         environment.beforeEach.call(this);
         let mockPointIndex = 0;
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(params, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(params, data) {
             const stub = mockPoints[mockPointIndex++];
             stub.argument = 1;
             stub.hasValue.returns(true);
@@ -181,7 +182,7 @@ const environmentWithSinonStubPoint = {
     QUnit.module('RangeSeries. API', {
         beforeEach: function() {
             environment.beforeEach.call(this);
-            this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+            this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
                 const stub = sinon.createStubInstance(originalPoint);
                 stub.argument = 1;
                 stub.hasValue.returns(true);
@@ -339,7 +340,7 @@ const environmentWithSinonStubPoint = {
             this.options = {
                 type: 'rangearea'
             };
-            this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function() {
+            this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function() {
                 const stub = sinon.createStubInstance(originalPoint);
                 stub.argument = 1;
                 stub.hasValue.returns(true);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/scatterSeries.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/scatterSeries.tests.js
index b0ebdb1172b8..99d40b13daea 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/scatterSeries.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/scatterSeries.tests.js
@@ -7,6 +7,7 @@ import pointModule from 'viz/series/points/base_point';
 import labelModule from 'viz/series/points/label';
 import SeriesModule from 'viz/series/base_series';
 import { insertMockFactory, MockAxis, restoreMockFactory } from '../../helpers/chartMocks.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const Series = SeriesModule.Series;
 
@@ -85,7 +86,7 @@ const environment = {
         this.renderer = new Renderer();
         this.seriesGroup = this.renderer.g();
         this.data = [{ arg: 1, val: 10 }, { arg: 2, val: 20 }, { arg: 3, val: 30 }, { arg: 4, val: 40 }];
-        this.createPoint = sinon.stub(pointModule, 'Point').callsFake(function(series, data) {
+        this.createPoint = stubSeam(pointModule, 'Point', 'DEBUG_set_Point').callsFake(function(series, data) {
             const stub = mockPoints[mockPointIndex++];
             data = data || {};
             stub.argument = data.argument || 1;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core.series/symbolPoint.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core.series/symbolPoint.tests.js
index fcda018b09c2..36cbe03cc342 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core.series/symbolPoint.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core.series/symbolPoint.tests.js
@@ -33,9 +33,10 @@ const environment = {
             return !this.draw.calledWith(false);
         });
 
-        this.labelFactory = labelModule.Label = sinon.spy(function() {
+        this.labelFactory = sinon.spy(function() {
             return that.label;
         });
+        labelModule.DEBUG_set_Label(this.labelFactory);
         this.options = {
             widgetType: 'chart',
             visible: true,
@@ -71,7 +72,7 @@ const environment = {
         };
     },
     afterEach: function() {
-        labelModule.Label = originalLabel;
+        labelModule.DEBUG_set_Label(originalLabel);
     }
 };
 const translateXData = { 'canvas_position_default': 'x0', 1: 'x1', 2: 'x2', 3: 'x3', 4: 'x4', 5: 'x5' };
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/annotations.plugins.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/annotations.plugins.tests.js
index 4651ac45599d..edc6f85f9664 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/annotations.plugins.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/annotations.plugins.tests.js
@@ -896,7 +896,7 @@ QUnit.test('Get coordinates using argument and location `edge`', function(assert
 QUnit.module('Lifecycle', {
     beforeEach() {
         this.renderer = new Renderer();
-        rendererModule.Renderer = sinon.spy(() => this.renderer);
+        rendererModule.DEBUG_set_Renderer(sinon.spy(() => this.renderer));
 
         this.createAnnotationStub = sinon.stub().returns([{ draw: sinon.spy(), plaque: { clear: sinon.spy() } }]);
         __test_utils.stub_createAnnotations(this.createAnnotationStub);
@@ -1289,16 +1289,16 @@ QUnit.module('Lifecycle', {
 const environment = {
     beforeEach() {
         this.renderer = new Renderer();
-        rendererModule.Renderer = sinon.spy(() => this.renderer);
+        rendererModule.DEBUG_set_Renderer(sinon.spy(() => this.renderer));
 
-        TooltipModule.Tooltip = sinon.spy((options) => {
+        TooltipModule.DEBUG_set_tooltip(sinon.spy((options) => {
             this.tooltip = new Tooltip(options);
             this.tooltip.show = sinon.stub().returns(true);
             this.tooltip.hide = sinon.spy();
             this.tooltip.move = sinon.spy();
             this.tooltip.isCursorOnTooltip = sinon.stub().returns(false);
             return this.tooltip;
-        });
+        }));
     },
     createChart(options) {
         const chart = $('<div>').appendTo('#qunit-fixture').dxChart($.extend(true, {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/axesTicksGeneration.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/axesTicksGeneration.tests.js
index 4ebb6c9dc17f..84f02146c2b7 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/axesTicksGeneration.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/axesTicksGeneration.tests.js
@@ -9,6 +9,7 @@ import {
 import { Axis } from 'viz/axes/base_axis';
 import translator2DModule from 'viz/translators/translator2d';
 import { Range } from 'viz/translators/range';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const StubTranslator = stubClass(translator2DModule.Translator2D, {
     updateBusinessRange: function(range) {
@@ -29,7 +30,7 @@ function getArray(len, content) {
 const environment = {
     beforeEach: function() {
         const that = this;
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
         this.renderer = new Renderer();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/axisDrawing.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/axisDrawing.tests.js
index a1cc51c986d2..cec3cac77391 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/axisDrawing.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/axisDrawing.tests.js
@@ -4,6 +4,7 @@ import translator2DModule from 'viz/translators/translator2d';
 import { Range } from 'viz/translators/range';
 import tickGeneratorModule from 'viz/axes/tick_generator';
 import { Axis } from 'viz/axes/base_axis';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import {
     Renderer,
     stubClass,
@@ -46,12 +47,12 @@ const environment = {
         };
 
         const that = this;
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
         this.renderer = new Renderer();
 
-        this.tickGenerator = sinon.stub(tickGeneratorModule, 'tickGenerator').callsFake(function() {
+        this.tickGenerator = stubSeam(tickGeneratorModule, 'tickGenerator', 'DEBUG_set_tickGenerator').callsFake(function() {
             return function() {
                 return {
                     ticks: that.generatedTicks || [],
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/axisFormatting.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/axisFormatting.tests.js
index 7138b4ecfdec..51da67218c09 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/axisFormatting.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/axisFormatting.tests.js
@@ -4,6 +4,7 @@ import translator2DModule from 'viz/translators/translator2d';
 import { Range } from 'viz/translators/range';
 import tickGeneratorModule from 'viz/axes/tick_generator';
 import { Axis } from 'viz/axes/base_axis';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import {
     Renderer,
     stubClass,
@@ -41,12 +42,12 @@ const environment = {
         };
 
         const that = this;
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
         this.renderer = new Renderer();
 
-        this.tickGenerator = sinon.stub(tickGeneratorModule, 'tickGenerator').callsFake(function() {
+        this.tickGenerator = stubSeam(tickGeneratorModule, 'tickGenerator', 'DEBUG_set_tickGenerator').callsFake(function() {
             return function() {
                 return {
                     ticks: that.generatedTicks || [],
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/baseAxis.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/baseAxis.tests.js
index 344d26c1edce..898cd12ed372 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/baseAxis.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/baseAxis.tests.js
@@ -10,6 +10,7 @@ import translator2DModule from 'viz/translators/translator2d';
 import { Range } from 'viz/translators/range';
 import xyMethods from '__internal/viz/axes/xy_axes';
 import { isFunction, isDeferred } from 'core/utils/type';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 const StubTranslator = stubClass(translator2DModule.Translator2D, {
     updateBusinessRange: function(range) {
@@ -29,7 +30,7 @@ const environment = {
                 tickInterval: that.generatedTickInterval
             };
         });
-        this.tickGenerator = sinon.stub(tickGeneratorModule, 'tickGenerator').callsFake(function() {
+        this.tickGenerator = stubSeam(tickGeneratorModule, 'tickGenerator', 'DEBUG_set_tickGenerator').callsFake(function() {
             return that.tickGeneratorSpy;
         });
 
@@ -175,7 +176,7 @@ QUnit.module('API', {
     beforeEach: function() {
         const that = this;
 
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
         environment.beforeEach.call(this);
@@ -1195,7 +1196,7 @@ QUnit.test('Validate visualRange, option is set', function(assert) {
 QUnit.module('Zoom', {
     beforeEach: function() {
         const that = this;
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
 
@@ -1698,7 +1699,7 @@ QUnit.test('Get visualRange. visualRange is defined', function(assert) {
 
 const dataMarginsEnvironment = {
     beforeEach: function() {
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         environment.beforeEach.call(this);
 
@@ -3597,7 +3598,7 @@ QUnit.test('Do not correct zero level if max > 0', function(assert) {
 QUnit.module('Set business range', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         this.axis = new Axis({
             renderer: this.renderer,
@@ -4442,7 +4443,7 @@ QUnit.test('Logarithmic axis. Do not allowNegatives if option is not set and min
 QUnit.module('Set business range. Value axis', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         this.axis = new Axis({
             renderer: this.renderer,
@@ -4608,7 +4609,7 @@ QUnit.test('Value axis ignores visual range on update option', function(assert)
 QUnit.module('Visual range on update. Argument axis', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         this.axis = new Axis({
             renderer: this.renderer,
@@ -4992,7 +4993,7 @@ QUnit.test('Auto. Discrete axis - reset if visualRange consist of all old catego
 QUnit.module('Get scroll bounds', {
     beforeEach: function() {
         environment.beforeEach.call(this);
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         this.axis = new Axis({
             renderer: this.renderer,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/baseThemeManager.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/baseThemeManager.tests.js
index 3ed3e29c14cd..850c89478d2d 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/baseThemeManager.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/baseThemeManager.tests.js
@@ -2,6 +2,7 @@ import $ from 'jquery';
 import themeModule from 'viz/themes';
 import { BaseThemeManager } from 'viz/core/base_theme_manager';
 import paletteModule from '__internal/viz/paletteModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const currentTheme = themeModule.currentTheme();
 
@@ -34,9 +35,9 @@ const environment = {
         this.themeManager = new BaseThemeManager({ fontFields: [] });
         this.callback = sinon.spy();
         this.themeManager.setCallback(this.callback);
-        this.createPalette = sinon.stub(paletteModule, 'createPalette');
-        this.getDiscretePalette = sinon.stub(paletteModule, 'getDiscretePalette');
-        this.getAccentColor = sinon.stub(paletteModule, 'getAccentColor');
+        this.createPalette = stubSeam(paletteModule, 'createPalette', 'DEBUG_set_createPalette');
+        this.getDiscretePalette = stubSeam(paletteModule, 'getDiscretePalette', 'DEBUG_set_getDiscretePalette');
+        this.getAccentColor = stubSeam(paletteModule, 'getAccentColor', 'DEBUG_set_getAccentColor');
     },
 
     afterEach: function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/baseWidget.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/baseWidget.tests.js
index 9acf3a6812df..438481f779ec 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/baseWidget.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/baseWidget.tests.js
@@ -12,6 +12,7 @@ import BaseWidget from '__internal/viz/core/base_widget';
 import { DEBUG_createEventTrigger, DEBUG_createResizeHandler } from '__internal/viz/core/base_widget.utils';
 import { BaseThemeManager } from 'viz/core/base_theme_manager';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import { stubClass, environmentMethodInvoker, LoadingIndicator, Renderer, Title } from '../../helpers/vizMocks.js';
 import { implementationsMap } from 'core/utils/size';
 
@@ -54,7 +55,7 @@ QUnit.begin(function() {
 
     registerComponent('dxBaseWidgetTester', dxBaseWidgetTester);
 
-    sinon.stub(rendererModule, 'Renderer').callsFake(function() {
+    stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
         return currentTest().renderer;
     });
 });
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/export.integration.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/export.integration.tests.js
index 7f974ef2aef4..90e8cd06303d 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/export.integration.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/export.integration.tests.js
@@ -2,7 +2,8 @@ import '__internal/viz/tree_map/tree_map';
 import $ from 'jquery';
 import { Renderer, ExportMenu } from '../../helpers/vizMocks.js';
 import rendererModule from 'viz/core/renderers/renderer_default';
-import clientExporter from 'exporter';
+import * as clientExporter from 'exporter';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import exportModule from '__internal/viz/core/exportModule';
 import { Deferred } from 'core/utils/deferred';
 import { logger } from 'core/utils/console';
@@ -22,14 +23,14 @@ QUnit.module('Export', {
     beforeEach: function() {
         this.$container = $('#test-container');
         const renderer = this.renderer = new Renderer();
-        rendererModule.Renderer = function() {
+        rendererModule.DEBUG_set_Renderer(function() {
             return renderer;
-        };
+        });
 
         const exportMenu = this.exportMenu = new ExportMenu();
         exportModule.DEBUG_set_ExportMenu(sinon.spy(function() { return exportMenu; }));
 
-        sinon.stub(clientExporter, 'export').returns(new Deferred());
+        stubSeam(clientExporter, 'export').returns(new Deferred());
 
         this.toDataURLStub = sinon.stub(window.HTMLCanvasElement.prototype, 'toDataURL');
         this.toDataURLStub.returnsArg(0);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/export.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/export.tests.js
index 15ce7e3c2c38..a745f3048761 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/export.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/export.tests.js
@@ -2,7 +2,8 @@ import $ from 'jquery';
 import { Renderer } from '../../helpers/vizMocks.js';
 import exportModule from '__internal/viz/core/exportModule';
 import themeModule from 'viz/themes';
-import clientExporter from 'exporter';
+import * as clientExporter from 'exporter';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import localization from 'localization';
 
 const combineMarkupsOrig = exportModule.combineMarkups;
@@ -559,7 +560,7 @@ QUnit.test('Combine widgets markups (combineMarkups) in grid layout with bottom-
 
 QUnit.module('API. Export methods', {
     beforeEach: function() {
-        sinon.stub(clientExporter, 'export');
+        stubSeam(clientExporter, 'export');
         this.toDataURLStub = sinon.stub(window.HTMLCanvasElement.prototype, 'toDataURL');
         this.toDataURLStub.returnsArg(0);
     },
@@ -828,7 +829,7 @@ QUnit.module('API', {
         this.renderer = new Renderer();
         this.incidentOccurred = sinon.spy();
 
-        sinon.stub(clientExporter, 'export');
+        stubSeam(clientExporter, 'export');
         this.options = {
             printingEnabled: true,
             formats: ['JPEG'],
@@ -1055,7 +1056,7 @@ QUnit.module('Events', {
         this.renderer = new Renderer();
         this.incidentOccurred = sinon.spy();
 
-        sinon.stub(clientExporter, 'export');
+        stubSeam(clientExporter, 'export');
 
         this.options = {
             enabled: true,
@@ -1365,7 +1366,7 @@ QUnit.module('Layout', {
         this.renderer = new Renderer();
         this.incidentOccurred = sinon.spy();
 
-        sinon.stub(clientExporter, 'export');
+        stubSeam(clientExporter, 'export');
 
         this.options = {
             enabled: true,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/legend.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/legend.tests.js
index 055dfdbe8026..1927e8eb96da 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/legend.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/legend.tests.js
@@ -2215,7 +2215,7 @@ const titleEnvironment = $.extend({}, environment, {
         const titleConstructor = module.Title;
 
         that.titleLayout = { height: 17, width: 20, x: 4, y: 5 };
-        module.Title = function(params) {
+        module.DEBUG_set_title(function(params) {
             that.title = new titleConstructor(params);
 
             that.title.getLayoutOptions = sinon.stub();
@@ -2231,7 +2231,7 @@ const titleEnvironment = $.extend({}, environment, {
             that.title.shift = sinon.spy();
 
             return that.title;
-        };
+        });
 
         that.themeManagerTitleOptions = {
             backgroundColor: '#ffffff',
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/polarAxes.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/polarAxes.tests.js
index 7d035cb017b9..0db79c4ec9e0 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/polarAxes.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/polarAxes.tests.js
@@ -8,6 +8,7 @@ import tickGeneratorModule from 'viz/axes/tick_generator';
 import rangeModule from 'viz/translators/range';
 import { Axis } from 'viz/axes/base_axis';
 import { extend } from 'core/utils/extend';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 const TranslatorStubCtor = new ObjectPool(translator2DModule.Translator2D);
 const RangeStubCtor = new ObjectPool(rangeModule.Range);
@@ -31,7 +32,7 @@ const environment = {
 
         this.renderer = new Renderer();
 
-        this.tickGenerator = sinon.stub(tickGeneratorModule, 'tickGenerator').callsFake(function() {
+        this.tickGenerator = stubSeam(tickGeneratorModule, 'tickGenerator', 'DEBUG_set_tickGenerator').callsFake(function() {
             return sinon.spy(function() {
                 return {
                     ticks: that.generatedTicks || [],
@@ -95,7 +96,7 @@ const environment = {
         br.isEmpty.returns(true);
         this.translator.getBusinessRange.returns(br);
 
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
     },
@@ -139,7 +140,7 @@ QUnit.module('Translators in axis', {
     beforeEach: function() {
         environment.beforeEach.call(this);
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
     },
     afterEach: function() {
         environment.afterEach.call(this);
@@ -2230,7 +2231,7 @@ QUnit.module('Circular axis. Margins', $.extend({}, environment, {
         environment.beforeEach.call(this);
 
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         $.extend(this.renderSettings, {
             axisType: 'polarAxes',
@@ -2328,7 +2329,7 @@ QUnit.module('Linear axis. Margins', $.extend({}, environment, {
         environment.beforeEach.call(this);
 
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         $.extend(this.renderSettings, {
             axisType: 'polarAxes',
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/tooltip.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/tooltip.tests.js
index de756462d436..aeef5b01833c 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/tooltip.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/tooltip.tests.js
@@ -56,11 +56,11 @@ function getInitialOptions() {
     };
 }
 
-rendererModule.Renderer = function(parameters) {
+rendererModule.DEBUG_set_Renderer(function(parameters) {
     const renderer = new Renderer(parameters);
     currentTest().renderer = renderer;
     return renderer;
-};
+});
 
 QUnit.module('Main functionality', {
     beforeEach: function() {
@@ -68,10 +68,10 @@ QUnit.module('Main functionality', {
 
         this._oldPatchFontOptions = vizUtils.patchFontOptions;
         this.patchFontOptions = sinon.spy(function() { return this._oldPatchFontOptions.apply(null, arguments); }.bind(this));
-        vizUtils.patchFontOptions = this.patchFontOptions;
+        vizUtils.DEBUG_set_patchFontOptions(this.patchFontOptions);
     },
     afterEach: function() {
-        vizUtils.patchFontOptions = this._oldPatchFontOptions;
+        vizUtils.DEBUG_set_patchFontOptions(this._oldPatchFontOptions);
     }
 });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.core/xyAxes.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.core/xyAxes.tests.js
index ddee7066bde7..561c72f18776 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.core/xyAxes.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.core/xyAxes.tests.js
@@ -9,6 +9,7 @@ import rangeModule from 'viz/translators/range';
 import { Axis } from 'viz/axes/base_axis';
 import { MockSeries } from '../../helpers/chartMocks.js';
 import { patchFontOptions } from 'viz/core/utils';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 const Translator2D = translator2DModule.Translator2D;
 
@@ -45,11 +46,11 @@ const environment = {
                 breaks: breaks
             };
         });
-        this.tickGenerator = sinon.stub(tickGeneratorModule, 'tickGenerator').callsFake(function() {
+        this.tickGenerator = stubSeam(tickGeneratorModule, 'tickGenerator', 'DEBUG_set_tickGenerator').callsFake(function() {
             return that.tickGeneratorSpy;
         });
 
-        sinon.stub(translator2DModule, 'Translator2D').callsFake(function() {
+        stubSeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D').callsFake(function() {
             return that.translator;
         });
 
@@ -208,7 +209,7 @@ QUnit.module('Translators in axis', {
     beforeEach: function() {
         environment.beforeEach.call(this);
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
     },
     afterEach: function() {
         environment.afterEach.call(this);
@@ -4377,7 +4378,7 @@ QUnit.module('XY axes margin calculation', {
         environment.beforeEach.call(this);
 
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
         this.canvas = {
             top: 200,
@@ -5084,7 +5085,7 @@ QUnit.module('Custom positioning', {
         };
 
         translator2DModule.Translator2D.restore();
-        sinon.spy(translator2DModule, 'Translator2D');
+        spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
     },
     afterEach: function() {
         environment.afterEach.call(this);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/common.js b/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/common.js
index b8176f837f89..b323705b352c 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/common.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/common.js
@@ -3,6 +3,7 @@ import {
     Renderer
 } from '../../../helpers/vizMocks.js';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import * as tiling from '__internal/viz/funnel/tiling';
 
 import '__internal/viz/funnel/funnel';
@@ -44,7 +45,7 @@ export const environment = {
 
         this.itemGroupNumber = 0;
 
-        sinon.stub(rendererModule, 'Renderer').callsFake(function() {
+        stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
             return that.renderer;
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/label.js b/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/label.js
index f2090e457b63..8eb284de2244 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/label.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.funnel/commonParts/label.js
@@ -2,10 +2,11 @@ import $ from 'jquery';
 import { environment, stubAlgorithm } from './common.js';
 import labelModule from 'viz/series/points/label';
 import {
-    stubClass
+    stubClass,
 } from '../../../helpers/vizMocks.js';
 import * as labels from '__internal/viz/funnel/label';
 import dxFunnel from '__internal/viz/funnel/funnel';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 
 const Label = labelModule.Label;
 const stubLabel = stubClass(Label);
@@ -34,7 +35,7 @@ export const labelEnvironment = $.extend({}, environment, {
 
         const that = this;
 
-        sinon.stub(labelModule, 'Label').callsFake(function() {
+        stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             const stub = new stubLabel();
             stub.stub('isVisible').returns(true);
             stub.stub('getBoundingRect').returns(that.labelBoxes[(labelBoxesIndex++) % that.labelBoxes.length]);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.base.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.base.tests.js
index 1082fd01539c..5b44ef929e8f 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.base.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.base.tests.js
@@ -1,9 +1,10 @@
 import $ from 'jquery';
 import { createFunnel, environment, stubAlgorithm } from './commonParts/common.js';
-import rendererModule from 'viz/core/renderers/renderer';
+import rendererModule from 'viz/core/renderers/renderer_default';
 import paletteModule from '__internal/viz/paletteModule';
 
 import themeModule from 'viz/themes';
+import { spySeam } from '../../helpers/moduleSeam.js';
 
 themeModule.registerTheme({
     name: 'test-theme',
@@ -271,7 +272,7 @@ QUnit.test('Resize', function(assert) {
 });
 
 QUnit.test('palette', function(assert) {
-    sinon.spy(paletteModule, 'createPalette');
+    spySeam(paletteModule, 'createPalette', 'DEBUG_set_createPalette');
 
     stubAlgorithm.normalizeValues.returns([1, 1]);
     stubAlgorithm.getFigures.returns([
@@ -452,7 +453,7 @@ QUnit.test('Update inverted option', function(assert) {
 });
 
 QUnit.test('Update palette', function(assert) {
-    sinon.spy(paletteModule, 'createPalette');
+    spySeam(paletteModule, 'createPalette', 'DEBUG_set_createPalette');
 
     stubAlgorithm.normalizeValues.returns([1, 1]);
     stubAlgorithm.getFigures.returns([
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.tracker.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.tracker.tests.js
index e7a9d31d308d..966ee647702e 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.tracker.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.funnel/funnel.tracker.tests.js
@@ -8,6 +8,7 @@ import legendModule from 'viz/components/legend';
 import { createFunnel, environment } from './commonParts/common.js';
 import labelModule from 'viz/series/points/label';
 import { stubClass } from '../../helpers/vizMocks.js';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const stubLabel = stubClass(labelModule.Label);
 const stubLegend = stubClass(legendModule.Legend);
@@ -28,7 +29,7 @@ const trackerEnvironment = $.extend({}, environment, {
         const that = this;
         environment.beforeEach.apply(this);
         this.legend = new stubLegend();
-        sinon.stub(labelModule, 'Label').callsFake(function() {
+        stubSeam(labelModule, 'Label', 'DEBUG_set_Label').callsFake(function() {
             const stub = new stubLabel();
             stub.stub('getBoundingRect').returns({
                 width: 0,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge.tests.js
index 9b44a0a266e2..0858624beb52 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge.tests.js
@@ -24,7 +24,7 @@ const { BarWrapper, stubBarWrapper, restoreBarWrapper } = barGaugeModule;
 $('<div id="test-container">').appendTo('#qunit-fixture');
 let renderer;
 QUnit.begin(function() {
-    rendererModule.Renderer = sinon.spy(function() {
+    rendererModule.DEBUG_set_Renderer(sinon.spy(function() {
         const test = currentTest();
         test.renderer = renderer || new Renderer();
         test.renderer.g = sinon.spy(function() {
@@ -93,7 +93,7 @@ QUnit.begin(function() {
         });
 
         return test.renderer;
-    });
+    }));
     titleModule.DEBUG_set_title(sinon.spy(function() {
         const title = new Title();
         title.getLayoutOptions = () => ({
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge_new.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge_new.tests.js
index 0a3f0b971eec..3565c73117cf 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge_new.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/barGauge_new.tests.js
@@ -8,6 +8,7 @@ import {
     stubClass
 } from '../../helpers/vizMocks.js';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import titleModule from 'viz/core/title';
 import tooltipModule from 'viz/core/tooltip';
 import loadingIndicatorModule from 'viz/core/loading_indicator';
@@ -21,7 +22,7 @@ const environment = {
     beforeEach() {
         this.renderer = new Renderer();
 
-        sinon.stub(rendererModule, 'Renderer').callsFake(() => {
+        stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(() => {
             return this.renderer;
         });
     },
@@ -49,13 +50,13 @@ $('<div id="test-container"></div>')
 const _LoadingIndicator = loadingIndicatorModule.LoadingIndicator;
 
 titleModule.DEBUG_set_title(Title);
-tooltipModule.Tooltip = Tooltip;
+tooltipModule.DEBUG_set_tooltip(Tooltip);
 loadingIndicatorModule.DEBUG_set_LoadingIndicator(LoadingIndicator);
 
 QUnit.module('Misc', {
     beforeEach: function() {
         const renderer = this.renderer = new Renderer();
-        rendererModule.Renderer = function() { return renderer; };
+        rendererModule.DEBUG_set_Renderer(function() { return renderer; });
     },
 
     create: function(options) {
@@ -171,7 +172,7 @@ QUnit.module('Legend', {
     beforeEach() {
         this.renderer = new Renderer();
 
-        sinon.stub(rendererModule, 'Renderer').callsFake(() => {
+        stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(() => {
             return this.renderer;
         });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/baseGauge.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/baseGauge.tests.js
index 4ee430fb18e3..1e8f6a2df266 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/baseGauge.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/baseGauge.tests.js
@@ -52,9 +52,9 @@ $.each(ABSTRACT_METHODS, function(_, name) {
     BaseGauge.prototype[name] = sinon.stub();
 });
 
-rendererModule.Renderer = sinon.spy(function() {
+rendererModule.DEBUG_set_Renderer(sinon.spy(function() {
     return currentTest().renderer;
-});
+}));
 
 themeManagerModule.ThemeManager = sinon.spy(function() {
     return currentTest().themeManager;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/circularGauge.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/circularGauge.tests.js
index 7aa45225f2d6..d173e86d006a 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/circularGauge.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/circularGauge.tests.js
@@ -8,6 +8,7 @@ import {
 import dxCircularGauge from 'viz/circular_gauge';
 import axisModule from 'viz/axes/base_axis';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const factory = dxCircularGauge.prototype._factory;
 
@@ -105,9 +106,9 @@ class TestPointerElement extends TestElement {
 }
 
 (function circularGauge() {
-    rendererModule.Renderer = sinon.stub();
+    rendererModule.DEBUG_set_Renderer(sinon.stub());
 
-    sinon.stub(axisModule, 'Axis').callsFake(function(parameters) {
+    stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function(parameters) {
         const axis = new Axis(parameters);
         axis.measureLabels = sinon.stub().returns({
             width: 30,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/common.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/common.tests.js
index f17fb9d6541c..1dfb91b51612 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/common.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/common.tests.js
@@ -24,12 +24,13 @@ import rangeModule from 'viz/translators/range';
 import translator1DModule from 'viz/translators/translator1d';
 import rendererModule from 'viz/core/renderers/renderer_default';
 import themeManagerModule from '__internal/viz/gauges/theme_manager';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const stubRange = stubClass(rangeModule.Range);
 
 $('<div id="test-container">').appendTo('#qunit-fixture');
 
-sinon.stub(rangeModule, 'Range').callsFake(function(parameters) {
+stubSeam(rangeModule, 'Range', 'DEBUG_set_Range').callsFake(function(parameters) {
     return new stubRange(parameters);
 });
 
@@ -80,11 +81,11 @@ const factory = dxTestGauge.prototype._factory = objectUtils.clone(dxGauge.proto
 registerComponent('dxTestGauge', dxTestGauge);
 
 const StubTooltip = Tooltip;
-tooltipModule.Tooltip = function(parameters) {
+tooltipModule.DEBUG_set_tooltip(function(parameters) {
     return new StubTooltip(parameters);
-};
+});
 
-sinon.stub(axisModule, 'Axis').callsFake(function(parameters) {
+stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function(parameters) {
     return new Axis(parameters);
 });
 
@@ -181,7 +182,7 @@ loadingIndicatorModule.DEBUG_set_LoadingIndicator(function(parameters) {
     return new LoadingIndicator(parameters);
 });
 
-sinon.stub(rendererModule, 'Renderer').callsFake(function() {
+stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
     return currentTest().renderer;
 });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.gauges/linearGauge.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.gauges/linearGauge.tests.js
index d04bbcc54d8f..92025d3131fa 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.gauges/linearGauge.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.gauges/linearGauge.tests.js
@@ -5,6 +5,7 @@ import { Axis as VizMocksAxis, Renderer as VizMocksRenderer } from '../../helper
 import dxLinearGauge from 'viz/linear_gauge';
 import axisModule from 'viz/axes/base_axis';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const factory = dxLinearGauge.prototype._factory;
 
@@ -100,9 +101,9 @@ class TestPointerElement extends TestElement {
 }
 
 (function linearGauge() {
-    rendererModule.Renderer = sinon.stub();
+    rendererModule.DEBUG_set_Renderer(sinon.stub());
 
-    sinon.stub(axisModule, 'Axis').callsFake(function(parameters) {
+    stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function(parameters) {
         const axis = new VizMocksAxis(parameters);
         axis.measureLabels = sinon.stub().returns({
             width: 30,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part1.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part1.tests.js
index 3ecc2744688f..3891b97818c0 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part1.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part1.tests.js
@@ -1,5 +1,6 @@
 import $ from 'jquery';
 import trackerModule from 'viz/range_selector/tracker';
+import { spySeam } from '../../helpers/moduleSeam.js';
 import { DataSource } from 'common/data/data_source/data_source';
 import seriesDataSourceModule from 'viz/range_selector/series_data_source';
 import {
@@ -196,7 +197,7 @@ QUnit.test('correct sliders place holder size by values', function(assert) {
 });
 
 QUnit.test('Tracker creation', function(assert) {
-    const spy = sinon.spy(trackerModule, 'Tracker');
+    const spy = spySeam(trackerModule, 'Tracker', 'DEBUG_set_Tracker');
     this.createWidget();
 
     assert.deepEqual(spy.lastCall.args, [{ renderer: this.renderer, controller: this.slidersController }]);
@@ -261,7 +262,7 @@ QUnit.test('dataSource is loaded', function(assert) {
 });
 
 QUnit.test('Update axis canvas before create series dataSorce', function(assert) {
-    const spy = sinon.spy(seriesDataSourceModule, 'SeriesDataSource');
+    const spy = spySeam(seriesDataSourceModule, 'SeriesDataSource', 'DEBUG_set_SeriesDataSource');
     this.seriesDataSource.stub('getBoundRange').returns({
         arg: new StubRange(),
         val: new StubRange()
@@ -379,7 +380,7 @@ QUnit.test('scale. not valid logarithmBase, string', function(assert) {
 });
 
 QUnit.test('valueAxis. logarithmic type', function(assert) {
-    const spy = sinon.spy(seriesDataSourceModule, 'SeriesDataSource');
+    const spy = spySeam(seriesDataSourceModule, 'SeriesDataSource', 'DEBUG_set_SeriesDataSource');
     this.seriesDataSource.stub('getBoundRange').returns({
         arg: new StubRange(),
         val: new StubRange()
@@ -400,7 +401,7 @@ QUnit.test('valueAxis. logarithmic type', function(assert) {
 });
 
 QUnit.test('valueAxis. not valid logarithmBase', function(assert) {
-    const spy = sinon.spy(seriesDataSourceModule, 'SeriesDataSource');
+    const spy = spySeam(seriesDataSourceModule, 'SeriesDataSource', 'DEBUG_set_SeriesDataSource');
     this.seriesDataSource.stub('isShowChart').returns(true);
     this.seriesDataSource.stub('getBoundRange').returns({
         arg: new StubRange(),
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part2.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part2.tests.js
index fd2ddaa1be90..1aeaabbf35b1 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part2.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part2.tests.js
@@ -56,10 +56,10 @@ const environmentWithDataSource = $.extend({}, environment, {
     beforeEach: function() {
         environment.beforeEach.apply(this, arguments);
         const test = this;
-        seriesDataSourceModule.SeriesDataSource = function(params) {
+        seriesDataSourceModule.DEBUG_set_SeriesDataSource(function(params) {
             test.seriesDataSource = new _SeriesDataSource(params);
             return test.seriesDataSource;
-        };
+        });
     }
 });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part3.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part3.tests.js
index 34f401fc6702..6b0d5fe5bad7 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part3.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common.part3.tests.js
@@ -8,6 +8,7 @@ import {
     StubRange,
 } from './rangeSelectorParts/commons.js';
 import slidersControllerModule from 'viz/range_selector/sliders_controller';
+import { spySeam } from '../../helpers/moduleSeam.js';
 import seriesDataSourceModule from 'viz/range_selector/series_data_source';
 import { DataSource } from 'common/data/data_source/data_source';
 import dateLocalization from 'common/core/localization/date';
@@ -23,7 +24,7 @@ const formatsAreEqual = function(format1, format2) {
 QUnit.module('Parsing data', $.extend({}, environment, {
     beforeEach: function() {
         environment.beforeEach.apply(this, arguments);
-        seriesDataSourceModule.SeriesDataSource = _SeriesDataSource;
+        seriesDataSourceModule.DEBUG_set_SeriesDataSource(_SeriesDataSource);
         this.dataSource = [
             { x: '10', y1: 0, y2: 10 },
             { x: '15', y1: 6, y2: 12 },
@@ -400,7 +401,7 @@ QUnit.test('rangeSelector with scale.valueType and dataSourceField and without c
 QUnit.module('Semidiscrete scale', $.extend({}, environment, {
     beforeEach: function() {
         environment.beforeEach.apply(this, arguments);
-        seriesDataSourceModule.SeriesDataSource = _SeriesDataSource;
+        seriesDataSourceModule.DEBUG_set_SeriesDataSource(_SeriesDataSource);
 
         this.$container.width(1000);
     }
@@ -1299,7 +1300,7 @@ QUnit.test('T214998. scale multi-line text label', function(assert) {
 });
 
 QUnit.test('range selectedRangeChanged initialization', function(assert) {
-    const spy = sinon.spy(slidersControllerModule, 'SlidersController');
+    const spy = spySeam(slidersControllerModule, 'SlidersController', 'DEBUG_set_SlidersController');
     this.createWidget();
 
     assert.strictEqual(typeof spy.lastCall.args[0].updateSelectedRange, 'function');
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common_new.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common_new.tests.js
index 6eb75b4446ea..e53b49d267dd 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common_new.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/common_new.tests.js
@@ -7,6 +7,7 @@ import rendererModule from 'viz/core/renderers/renderer_default';
 import axisModule from 'viz/axes/base_axis';
 import translator2DModule from 'viz/translators/translator2d';
 import '__internal/viz/range_selector/range_selector';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const StubAxis = stubClass(axisModule.Axis);
 
@@ -27,10 +28,10 @@ QUnit.module('RangeSelector', {
         const that = this;
         this.$container = $('#test-container');
         const renderer = this.renderer = new Renderer();
-        rendererModule.Renderer = function() { return renderer; };
+        rendererModule.DEBUG_set_Renderer(function() { return renderer; });
         this.axis = new StubAxis();
         this.axis.stub('getVisibleArea').returns([]);
-        sinon.stub(axisModule, 'Axis').callsFake(function() {
+        stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis').callsFake(function() {
             return that.axis;
         });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeSelectorParts/commons.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeSelectorParts/commons.js
index e2d9825cb24c..8cc8190597fe 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeSelectorParts/commons.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeSelectorParts/commons.js
@@ -16,6 +16,7 @@ import {
     Renderer,
 } from '../../../helpers/vizMocks.js';
 import '__internal/viz/range_selector/range_selector';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 
 const StubThemeManager = stubClass(themeManagerModule.BaseThemeManager);
 const StubRangeView = stubClass(rangeViewModule.RangeView);
@@ -75,15 +76,15 @@ export const environment = {
         this.axis.calculateInterval = function(a, b) { return a - b; };
         this.seriesDataSource = new StubSeriesDataSource();
 
-        rendererModule.Renderer = returnValue(this.renderer);
-        themeManagerModule.BaseThemeManager = returnValue(this.themeManager);
-        rangeViewModule.RangeView = returnValue(this.rangeView);
-        slidersControllerModule.SlidersController = returnValue(this.slidersController);
-        trackerModule.Tracker = returnValue(this.tracker);
-        seriesDataSourceModule.SeriesDataSource = returnValue(this.seriesDataSource);
-        translator2DModule.Translator2D = returnValue(this.translator);
+        rendererModule.DEBUG_set_Renderer(returnValue(this.renderer));
+        themeManagerModule.DEBUG_set_BaseThemeManager(returnValue(this.themeManager));
+        rangeViewModule.DEBUG_set_RangeView(returnValue(this.rangeView));
+        slidersControllerModule.DEBUG_set_SlidersController(returnValue(this.slidersController));
+        trackerModule.DEBUG_set_Tracker(returnValue(this.tracker));
+        seriesDataSourceModule.DEBUG_set_SeriesDataSource(returnValue(this.seriesDataSource));
+        translator2DModule.DEBUG_set_Translator2D(returnValue(this.translator));
 
-        sinon.stub(axisModule, 'Axis');
+        stubSeam(axisModule, 'Axis', 'DEBUG_set_Axis');
         axisModule.Axis.returns(this.axis);
     },
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeView.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeView.tests.js
index 7c09e4d92efb..a78728925ff8 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeView.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/rangeView.tests.js
@@ -3,6 +3,7 @@ import { Renderer, Element } from '../../helpers/vizMocks.js';
 import translator2DModule from 'viz/translators/translator2d';
 import rangeViewModule from 'viz/range_selector/range_view';
 import { MockAxis } from '../../helpers/chartMocks.js';
+import { spySeam } from '../../helpers/moduleSeam.js';
 
 QUnit.module('RangeView', {
     beforeEach: function() {
@@ -99,7 +100,7 @@ QUnit.test('Chart view', function(assert) {
 
 QUnit.test('Chart view is not created because of seriesDataSource', function(assert) {
     const seriesDataSource = { isShowChart: function() { return false; } };
-    const Translator2D = sinon.spy(translator2DModule, 'Translator2D');
+    const Translator2D = spySeam(translator2DModule, 'Translator2D', 'DEBUG_set_Translator2D');
 
     try {
         this.rangeView.update({ color: 'red', image: { url: 'url' } }, { visible: true, image: { location: 'loc' } }, this.canvas, false, 'animation-enabled', seriesDataSource, 'translator');
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/slidersController.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/slidersController.tests.js
index 894f6c168aae..45c3daf026a6 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/slidersController.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.rangeSelector/slidersController.tests.js
@@ -12,9 +12,9 @@ const environment = {
     beforeEach: function() {
         const renderer = this.renderer = new Renderer();
 
-        rendererModule.Renderer = function() {
+        rendererModule.DEBUG_set_Renderer(function() {
             return renderer;
-        };
+        });
         this.translator = new translator2DModule.Translator2D({}, {});
         this.translator.update({ min: 10, max: 30 }, { left: 1000, width: 3000 }, { isHorizontal: true });
         this.root = new Element();
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.renderers/Animation.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.renderers/Animation.tests.js
index 31eb6bc37b2a..4a704f9ae1e5 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.renderers/Animation.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.renderers/Animation.tests.js
@@ -2,10 +2,11 @@
 
 import $ from 'jquery';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 import commonUtils from 'core/utils/common';
 import typeUtils from 'core/utils/type';
 import animationModule from 'viz/core/renderers/animation';
-import rendererModule from 'viz/core/renderers/renderer';
+import rendererModule from 'viz/core/renderers/renderer_default';
 import {
     stubClass
 } from '../../helpers/vizMocks.js';
@@ -49,10 +50,10 @@ import {
             this.animationController.dispose();
         },
         mockRequestAnimationFrame: function(callback) {
-            this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake(callback);
+            this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake(callback);
         },
         mockCancelAnimationFrame: function(callback) {
-            this.cancelAnimationFrameStub = sinon.stub(animationFrame, 'cancelAnimationFrame').callsFake(callback);
+            this.cancelAnimationFrameStub = stubSeam(animationFrame, 'cancelAnimationFrame', 'DEBUG_set_cancelAnimationFrame').callsFake(callback);
         }
     });
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.renderers/Renderer.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.renderers/Renderer.tests.js
index 78cf7bb4d83b..0c6015395584 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.renderers/Renderer.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.renderers/Renderer.tests.js
@@ -19,7 +19,7 @@ function getMockElement() {
     };
 }
 
-utils.getNextDefsSvgId = sinon.stub().returns('DevExpressId');
+utils.DEBUG_set_getNextDefsSvgId(sinon.stub().returns('DevExpressId'));
 
 QUnit.testDone(function() {
     renderers.SvgElement.resetHistory && renderers.SvgElement.resetHistory();
@@ -55,7 +55,7 @@ function resetMockElements() {
     });
 }
 
-animationModule.AnimationController = stubClass(animationModule.AnimationController);
+animationModule.DEBUG_set_AnimationController(stubClass(animationModule.AnimationController));
 
 const Renderer = renderers.Renderer;
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.renderers/SvgElement.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.renderers/SvgElement.tests.js
index 983aef44d59a..18217fde7c8c 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.renderers/SvgElement.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.renderers/SvgElement.tests.js
@@ -1,6 +1,6 @@
 import $ from 'jquery';
 import typeUtils from 'core/utils/type';
-import rendererModule from 'viz/core/renderers/renderer';
+import rendererModule from 'viz/core/renderers/renderer_default';
 import coreRenderer from 'core/renderer';
 import eventsEngine from 'common/core/events/core/events_engine';
 import domAdapter from '__internal/core/m_dom_adapter';
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sankey/commonParts/common.js b/packages/devextreme/testing/tests/DevExpress.viz.sankey/commonParts/common.js
index 5e38e191f7a3..0c2bd84b63fe 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sankey/commonParts/common.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sankey/commonParts/common.js
@@ -3,6 +3,7 @@ import {
     Renderer,
 } from '../../../helpers/vizMocks.js';
 import rendererModule from 'viz/core/renderers/renderer_default';
+import { stubSeam } from '../../../helpers/moduleSeam.js';
 import '__internal/viz/sankey/sankey';
 import 'viz/themes';
 import { layout as layoutBuilder } from '__internal/viz/sankey/layout';
@@ -40,7 +41,7 @@ const environment = {
         this.nodesGroupIndex = 1;
         this.labelsGroupIndex = 2;
 
-        sinon.stub(rendererModule, 'Renderer').callsFake(function() {
+        stubSeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer').callsFake(function() {
             return that.renderer;
         });
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sankey/sankey.base.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sankey/sankey.base.tests.js
index 0dca120df794..48584317190c 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sankey/sankey.base.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sankey/sankey.base.tests.js
@@ -1,8 +1,9 @@
 import $ from 'jquery';
 import { testData, createSankey, layoutBuilder, spiesLayoutBuilder, environment, find } from './commonParts/common.js';
-import rendererModule from 'viz/core/renderers/renderer';
+import rendererModule from 'viz/core/renderers/renderer_default';
 import paletteModule from '__internal/viz/paletteModule';
 import themeModule from 'viz/themes';
+import { spySeam } from '../../helpers/moduleSeam.js';
 
 themeModule.registerTheme({
     name: 'test-theme',
@@ -558,7 +559,7 @@ QUnit.test('Resize', function(assert) {
 });
 
 QUnit.test('Palette', function(assert) {
-    sinon.spy(paletteModule, 'createPalette');
+    spySeam(paletteModule, 'createPalette', 'DEBUG_set_createPalette');
 
     createSankey({
         dataSource: [{ source: 'A', target: 'Z', weight: 1 }, { source: 'B', target: 'Z', weight: 1 }],
@@ -737,7 +738,7 @@ QUnit.test('Update color of links', function(assert) {
 });
 
 QUnit.test('Update palette', function(assert) {
-    sinon.spy(paletteModule, 'createPalette');
+    spySeam(paletteModule, 'createPalette', 'DEBUG_set_createPalette');
 
     const sankey = createSankey({
         dataSource: [{ source: 'A', target: 'Z', weight: 1 }],
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/baseSparklineTooltipEvents.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/baseSparklineTooltipEvents.tests.js
index 6eaa14b4626b..ee165c407d14 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/baseSparklineTooltipEvents.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/baseSparklineTooltipEvents.tests.js
@@ -18,9 +18,9 @@ $('<div>')
     .appendTo(fixture);
 
 QUnit.begin(function() {
-    rendererModule.Renderer = function() {
+    rendererModule.DEBUG_set_Renderer(function() {
         return new Renderer();
-    };
+    });
 });
 
 const environment = (widget) => ({
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bullet.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bullet.tests.js
index 7918b96cbd85..eafab5d50af4 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bullet.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bullet.tests.js
@@ -20,9 +20,9 @@ QUnit.begin(function() {
         getCanvasVisibleArea: function() { return {}; }
     });
 
-    translator2DModule.Translator2D = sinon.spy(function() {
+    translator2DModule.DEBUG_set_Translator2D(sinon.spy(function() {
         return currentTest().translators.pop();
-    });
+    }));
 });
 
 QUnit.testStart(function() {
@@ -34,10 +34,10 @@ QUnit.testStart(function() {
     translator2DModule.Translator2D.resetHistory();
 });
 
-rendererModule.Renderer = sinon.spy(function(parameters) {
+rendererModule.DEBUG_set_Renderer(sinon.spy(function(parameters) {
     currentTest().renderer = new Renderer(parameters);
     return currentTest().renderer;
-});
+}));
 
 tooltipModule.DEBUG_set_tooltip(sinon.spy(function() {
     return currentTest().tooltip;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bulletTooltip.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bulletTooltip.tests.js
index f7b42f70408c..4f0b8ca8d434 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bulletTooltip.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/bulletTooltip.tests.js
@@ -26,13 +26,13 @@ const StubTooltip = stubClass(tooltipModule.Tooltip, { isEnabled: function() { r
 tooltipModule.DEBUG_set_tooltip(function(parameters) {
     return new StubTooltip(parameters);
 });
-rendererModule.Renderer = function() {
+rendererModule.DEBUG_set_Renderer(function() {
     return currentTest().renderer;
-};
+});
 
-baseThemeManagerModule.BaseThemeManager = function() {
+baseThemeManagerModule.DEBUG_set_BaseThemeManager(function() {
     return currentTest().themeManager;
-};
+});
 
 StubThemeManager.prototype.setTheme = function() {
     forceThemeOptions(this);
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparkline.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparkline.tests.js
index c6bb2c091825..3b9dc963c9ee 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparkline.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparkline.tests.js
@@ -16,6 +16,7 @@ import translator2DModule from 'viz/translators/translator2d';
 import seriesModule from 'viz/series/base_series';
 import { DataSource } from 'common/data/data_source/data_source';
 import 'viz/sparkline';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 $('<div>')
     .attr('id', 'container')
@@ -30,17 +31,17 @@ QUnit.begin(function() {
     const StubSeries = Series;
     const StubTooltip = Tooltip;
 
-    rendererModule.Renderer = sinon.spy(function() {
+    rendererModule.DEBUG_set_Renderer(sinon.spy(function() {
         return currentTest().renderer;
-    });
+    }));
 
-    translator2DModule.Translator2D = sinon.spy(function() {
+    translator2DModule.DEBUG_set_Translator2D(sinon.spy(function() {
         return new FakeTranslator();
-    });
+    }));
 
-    seriesModule.Series = sinon.spy(function() {
+    seriesModule.DEBUG_set_Series(sinon.spy(function() {
         return currentTest().series;
-    });
+    }));
 
     tooltipModule.DEBUG_set_tooltip(sinon.spy(function() {
         return currentTest().tooltip;
@@ -95,7 +96,7 @@ QUnit.begin(function() {
         return $.extend({}, environment, {
             beforeEach: function() {
                 environment.beforeEach.apply(this, arguments);
-                this.validateData = sinon.stub(dataValidatorModule, 'validateData').callsFake(function() {
+                this.validateData = stubSeam(dataValidatorModule, 'validateData', 'DEBUG_set_validateData').callsFake(function() {
                     return {
                         arg: [{
                             argument: 1,
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparklineTooltip.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparklineTooltip.tests.js
index 2f3ae286da64..5302b5f47339 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparklineTooltip.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.sparklines/sparklineTooltip.tests.js
@@ -34,13 +34,13 @@ StubThemeManager.prototype.setTheme = function() {
 tooltipModule.DEBUG_set_tooltip(function(parameters) {
     return new StubTooltip(parameters);
 });
-rendererModule.Renderer = function() {
+rendererModule.DEBUG_set_Renderer(function() {
     return new Renderer();
-};
+});
 
-baseThemeManagerModule.BaseThemeManager = function() {
+baseThemeManagerModule.DEBUG_set_BaseThemeManager(function() {
     return currentTest().themeManager;
-};
+});
 
 function getSparklineTooltip(sparkline) {
     return sparkline._tooltip;
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.treeMap/commonParts/common.js b/packages/devextreme/testing/tests/DevExpress.viz.treeMap/commonParts/common.js
index 8d8d94d95296..d961d03ded39 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.treeMap/commonParts/common.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.treeMap/commonParts/common.js
@@ -22,7 +22,7 @@ $('#test-container').css({ width: '600px', height: '400px' });
 /** Create a mocked renderer for TreeMap tests */
 export function createRenderer() {
     const renderer = new Renderer();
-    rendererModule.Renderer = function() { return renderer; };
+    rendererModule.DEBUG_set_Renderer(function() { return renderer; });
     return renderer;
 };
 
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/controlBar.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/controlBar.tests.js
index 04f7ed9a1ff0..0ef0bf53391e 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/controlBar.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/controlBar.tests.js
@@ -3,7 +3,7 @@ import { noop } from 'core/utils/common';
 import {
     Renderer,
 } from '../../helpers/vizMocks.js';
-import * as controlBarModule from 'viz/vector_map/control_bar/control_bar';
+import controlBarModule from 'viz/vector_map/control_bar/control_bar';
 
 function returnValue(value) {
     return function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dataExchanger.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dataExchanger.tests.js
index b0d890ba6339..f3832caec158 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dataExchanger.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dataExchanger.tests.js
@@ -1,4 +1,4 @@
-import * as dataExchangerModule from 'viz/vector_map/data_exchanger';
+import dataExchangerModule from 'viz/vector_map/data_exchanger';
 
 QUnit.module('DataExchanger', {
     beforeEach: function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dxVectorMap.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dxVectorMap.tests.js
index ffbbc3da422a..fa21a60efff8 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dxVectorMap.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/dxVectorMap.tests.js
@@ -18,6 +18,7 @@ import {
 } from '../../helpers/vizMocks.js';
 import typeUtils from 'core/utils/type';
 import plaqueModule from 'viz/core/plaque';
+import { stubSeam, spySeam } from '../../helpers/moduleSeam.js';
 
 import '__internal/viz/vector_map/vector_map';
 
@@ -26,7 +27,7 @@ const stubLayersEnvironment = $.extend({}, environment, {
         environment.beforeEach.apply(this, arguments);
         this.layerCollection.stub('items').returns([]);
         this.tracker.on = sinon.stub().returns(noop);
-        sinon.stub(plaqueModule, 'Plaque').returns({ draw: sinon.stub(), hitTest: sinon.stub(), clear: sinon.stub() });
+        stubSeam(plaqueModule, 'Plaque', 'DEBUG_set_Plaque').returns({ draw: sinon.stub(), hitTest: sinon.stub(), clear: sinon.stub() });
     },
     afterEach: function() {
         plaqueModule.Plaque.restore();
@@ -36,7 +37,7 @@ const stubLayersEnvironment = $.extend({}, environment, {
 QUnit.module('Map - elements', stubLayersEnvironment);
 
 QUnit.test('Renderer', function(assert) {
-    const spy = sinon.spy(rendererModule, 'Renderer');
+    const spy = spySeam(rendererModule, 'Renderer', 'DEBUG_set_Renderer');
 
     this.createMap({ pathModified: 'path-modified' });
 
@@ -63,7 +64,7 @@ QUnit.test('Background', function(assert) {
 });
 
 QUnit.test('Layer collection', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
 
     this.createMap({
         layers: [{ tag: 'layer-1', dataSource: 'data-1' }, { tag: 'layer-2', dataSource: 'data-2' }]
@@ -90,7 +91,7 @@ QUnit.test('Layer collection', function(assert) {
 });
 
 QUnit.test('Set bounds when data ready called. Without bounds in options', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [{
         proxy: { tag: 'p1', getBounds: function() { return [0, 0, 10, 10]; } },
         getData: function() { return { count: function() { return 0; } }; }
@@ -113,7 +114,7 @@ QUnit.test('Set bounds when data ready called. Without bounds in options', funct
 });
 
 QUnit.test('Projection by data. Default bounds are include common bounds', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [{
         proxy: { tag: 'p1', getBounds: function() { return [0, 0, 10, 10]; } },
         getData: function() { return { count: function() { return 0; } }; }
@@ -134,7 +135,7 @@ QUnit.test('Projection by data. Default bounds are include common bounds', funct
 });
 
 QUnit.test('Projection by data. Without projection in options', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [{
         proxy: { tag: 'p1', getBounds: function() { return [0, 0, 10, 10]; } },
         getData: function() { return { count: function() { return 0; } }; }
@@ -157,7 +158,7 @@ QUnit.test('Projection by data. Without projection in options', function(assert)
 });
 
 QUnit.test('Projection by data. Projection in options', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [{
         proxy: { tag: 'p1', getBounds: function() { return [0, 0, 10, 10]; } },
         getData: function() { return { count: function() { return 0; } }; }
@@ -178,7 +179,7 @@ QUnit.test('Projection by data. Projection in options', function(assert) {
 });
 
 QUnit.test('Bounds by data. Empty bbox', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [];
 
     this.layerCollection.stub('items').returns(layers);
@@ -195,7 +196,7 @@ QUnit.test('Bounds by data. Empty bbox', function(assert) {
 });
 
 QUnit.test('Set bounds when data ready called. With bounds in options', function(assert) {
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     const layers = [{
         proxy: { tag: 'p1', getBounds: function() { return [0, 0, 10, 10]; } },
         getData: function() {
@@ -232,7 +233,7 @@ QUnit.test('Layer collection - object option', function(assert) {
 });
 
 QUnit.test('Projection', function(assert) {
-    const spy = sinon.spy(projectionModule, 'Projection');
+    const spy = spySeam(projectionModule, 'Projection', 'DEBUG_set_Projection');
 
     this.createMap({
         projection: 'projection',
@@ -256,7 +257,7 @@ QUnit.test('Projection', function(assert) {
 });
 
 QUnit.test('DataExchanger', function(assert) {
-    const spy = sinon.spy(dataExchangerModule, 'DataExchanger');
+    const spy = spySeam(dataExchangerModule, 'DataExchanger', 'DEBUG_set_DataExchanger');
 
     this.createMap();
 
@@ -264,7 +265,7 @@ QUnit.test('DataExchanger', function(assert) {
 });
 
 QUnit.test('GestureHandler', function(assert) {
-    const spy = sinon.spy(gestureHandlerModule, 'GestureHandler');
+    const spy = spySeam(gestureHandlerModule, 'GestureHandler', 'DEBUG_set_GestureHandler');
 
     this.createMap({
         panningEnabled: 1,
@@ -282,7 +283,7 @@ QUnit.test('GestureHandler', function(assert) {
 });
 
 QUnit.test('LayoutControl', function(assert) {
-    const spy = sinon.spy(layoutModule, 'LayoutControl');
+    const spy = spySeam(layoutModule, 'LayoutControl', 'DEBUG_set_LayoutControl');
 
     const map = this.createMap({ layers: {} });
 
@@ -297,7 +298,7 @@ QUnit.test('LayoutControl', function(assert) {
 });
 
 QUnit.test('Tracker', function(assert) {
-    const spy = sinon.spy(trackerModule, 'Tracker');
+    const spy = spySeam(trackerModule, 'Tracker', 'DEBUG_set_Tracker');
 
     this.createMap({
         touchEnabled: 0,
@@ -315,7 +316,7 @@ QUnit.test('Tracker', function(assert) {
 });
 
 QUnit.test('Control bar', function(assert) {
-    const spy = sinon.spy(controlBarModule, 'ControlBar');
+    const spy = spySeam(controlBarModule, 'ControlBar', 'DEBUG_set_ControlBar');
     this.themeManager.theme.withArgs('controlBar').returns({ theme: 'control-bar' });
 
     this.createMap({
@@ -339,7 +340,7 @@ QUnit.test('Control bar', function(assert) {
 });
 
 QUnit.test('Legends', function(assert) {
-    const spy = sinon.spy(legendModule, 'LegendsControl');
+    const spy = spySeam(legendModule, 'LegendsControl', 'DEBUG_set_LegendsControl');
 
     const map = this.createMap({
         legends: {
@@ -362,7 +363,7 @@ QUnit.test('Legends', function(assert) {
 });
 
 QUnit.test('TooltipViewer', function(assert) {
-    const spy = sinon.spy(tooltipViewerModule, 'TooltipViewer');
+    const spy = spySeam(tooltipViewerModule, 'TooltipViewer', 'DEBUG_set_TooltipViewer');
 
     this.createMap();
 
@@ -437,8 +438,8 @@ QUnit.test('Should created group for annotations', function(assert) {
 });
 
 QUnit.test('Should created group for annotations before controll bar and legend', function(assert) {
-    const spyLegend = sinon.spy(legendModule, 'LegendsControl');
-    const spyControlBar = sinon.spy(controlBarModule, 'ControlBar');
+    const spyLegend = spySeam(legendModule, 'LegendsControl', 'DEBUG_set_LegendsControl');
+    const spyControlBar = spySeam(controlBarModule, 'ControlBar', 'DEBUG_set_ControlBar');
     this.createMap();
 
     assert.ok(this.renderer.g.returnValues[1].attr.calledBefore(spyControlBar));
@@ -548,7 +549,7 @@ QUnit.test('Applying bounds by data', function(assert) {
             };
         }
     }];
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     this.createMap({
         getBoundsFromData: true
     });
@@ -1019,7 +1020,7 @@ QUnit.module('drawn', stubLayersEnvironment);
 
 QUnit.test('call drawn after layer collection ready', function(assert) {
     const onDrawn = sinon.spy();
-    const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+    const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
     this.createMap({
         onDrawn: onDrawn
     });
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/map.elementsInteraction.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/map.elementsInteraction.tests.js
index 817d22978f41..93bba032c0f1 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/map.elementsInteraction.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/map.elementsInteraction.tests.js
@@ -6,6 +6,7 @@ import {
 } from './vectorMapParts/commons.js';
 import mapLayerModule from 'viz/vector_map/map_layer';
 import projectionModule from 'viz/vector_map/projection.main';
+import { spySeam } from '../../helpers/moduleSeam.js';
 import resizeCallbacks from 'core/utils/resize_callbacks';
 import { implementationsMap } from 'core/utils/size';
 import {
@@ -23,7 +24,7 @@ QUnit.module('Map - projection events', $.extend({}, environment, {
 
 QUnit.test('On center', function(assert) {
     const onCenterChanged = sinon.spy();
-    const spy = sinon.spy(projectionModule, 'Projection');
+    const spy = spySeam(projectionModule, 'Projection', 'DEBUG_set_Projection');
     this.createMap({ onCenterChanged: onCenterChanged });
 
     spy.lastCall.args[0].centerChanged('test-center');
@@ -33,7 +34,7 @@ QUnit.test('On center', function(assert) {
 
 QUnit.test('On zoom', function(assert) {
     const onZoomFactorChanged = sinon.spy();
-    const spy = sinon.spy(projectionModule, 'Projection');
+    const spy = spySeam(projectionModule, 'Projection', 'DEBUG_set_Projection');
     this.createMap({ onZoomFactorChanged: onZoomFactorChanged });
 
     spy.lastCall.args[0].zoomChanged('test-zoom');
@@ -43,7 +44,7 @@ QUnit.test('On zoom', function(assert) {
 
 QUnit.module('Map - event trigger interaction', $.extend({}, environment, {
     createMap: function() {
-        const spy = sinon.spy(mapLayerModule, 'MapLayerCollection');
+        const spy = spySeam(mapLayerModule, 'MapLayerCollection', 'DEBUG_set_MapLayerCollection');
         environment.createMap.apply(this, arguments);
         this.eventTrigger = spy.lastCall.args[0].eventTrigger;
     },
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/mapLayer_new.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/mapLayer_new.tests.js
index ee960f4526c4..afd83b5c966d 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/mapLayer_new.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/mapLayer_new.tests.js
@@ -27,9 +27,9 @@ titleModule.DEBUG_set_title(stubClass(titleModule.Title, { }));
 tooltipModule.DEBUG_set_tooltip(stubClass(tooltipModule.Tooltip));
 exportMenuModule.DEBUG_set_ExportMenu(stubClass(exportMenuModule.ExportMenu)); // TODO maybe if you test layer - you should create exact layer?
 loadingIndicatorModule.DEBUG_set_LoadingIndicator(stubClass(loadingIndicatorModule.LoadingIndicator));
-controlBarModule.ControlBar = stubClass(controlBarModule.ControlBar);
-legendModule.LegendsControl = stubClass(legendModule.LegendsControl);
-tooltipViewerModule.TooltipViewer = stubClass(tooltipViewerModule.TooltipViewer);
+controlBarModule.DEBUG_set_ControlBar(stubClass(controlBarModule.ControlBar));
+legendModule.DEBUG_set_LegendsControl(stubClass(legendModule.LegendsControl));
+tooltipViewerModule.DEBUG_set_TooltipViewer(stubClass(tooltipViewerModule.TooltipViewer));
 
 const simpleProjection = projection({
     aspectRatio: 4 / 3,
@@ -68,7 +68,7 @@ const createData = function(featureType, items) {
 const environment = {
     beforeEach: function() {
         const renderer = this.renderer = new Renderer();
-        rendererModule.Renderer = function() { return renderer; };
+        rendererModule.DEBUG_set_Renderer(function() { return renderer; });
     },
 
     createLayer: function(options) {
@@ -473,7 +473,7 @@ QUnit.test('Line labels', function(assert) {
 QUnit.module('Layers management', {
     beforeEach: function() {
         const renderer = this.renderer = new Renderer();
-        rendererModule.Renderer = function() { return renderer; };
+        rendererModule.DEBUG_set_Renderer(function() { return renderer; });
     },
 
     createLayers: function(options) {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/tracker.tests.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/tracker.tests.js
index d28f0c618e0e..142bbc7985ba 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/tracker.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/tracker.tests.js
@@ -13,6 +13,7 @@ import {
 import trackerModule from 'viz/vector_map/tracker';
 import { _TESTS_eventEmitterMethods } from '__internal/viz/vector_map/event_emitter';
 import animationFrame from '__internal/common/core/animation/frameModule';
+import { stubSeam } from '../../helpers/moduleSeam.js';
 
 const FOCUS_OFF_DELAY = 100;
 
@@ -55,8 +56,8 @@ const environment = {
         $.each(this.stubbedCallbacks || [], $.proxy(function(_, name) {
             this[name] = sinon.stub();
         }, this));
-        this.requestAnimationFrameStub = sinon.stub(animationFrame, 'requestAnimationFrame').callsFake(noop);
-        this.cancelAnimationFrameStub = sinon.stub(animationFrame, 'cancelAnimationFrame').callsFake(noop);
+        this.requestAnimationFrameStub = stubSeam(animationFrame, 'requestAnimationFrame', 'DEBUG_set_requestAnimationFrame').callsFake(noop);
+        this.cancelAnimationFrameStub = stubSeam(animationFrame, 'cancelAnimationFrame', 'DEBUG_set_cancelAnimationFrame').callsFake(noop);
         this.clock = sinon.useFakeTimers();
     },
     afterEach: function() {
diff --git a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/vectorMapParts/commons.js b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/vectorMapParts/commons.js
index 15850d90551d..a26c73e7a5b5 100644
--- a/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/vectorMapParts/commons.js
+++ b/packages/devextreme/testing/tests/DevExpress.viz.vectorMap/vectorMapParts/commons.js
@@ -48,21 +48,21 @@ StubThemeManager.prototype.setTheme = function() {
 };
 
 function stubComponentConstructors(test) {
-    rendererModule.Renderer = returnValue(test.renderer);
+    rendererModule.DEBUG_set_Renderer(returnValue(test.renderer));
     titleModule.DEBUG_set_title(returnValue(test.title));
     tooltipModule.DEBUG_set_tooltip(returnValue(test.tooltip));
     exportModule.DEBUG_set_ExportMenu(returnValue(test.exportMenu));
 
-    projectionModule.Projection = returnValue(test.projection);
-    controlBarModule.ControlBar = returnValue(test.controlBar);
-    gestureHandlerModule.GestureHandler = returnValue(test.gestureHandler);
-    trackerModule.Tracker = returnValue(test.tracker);
-    themeManagerModule.BaseThemeManager = returnValue(test.themeManager);
-    dataExchangerModule.DataExchanger = returnValue(test.dataExchanger);
-    legendModule.LegendsControl = returnValue(test.legendsControl);
-    layoutModule.LayoutControl = returnValue(test.layoutControl);
-    mapLayerModule.MapLayerCollection = returnValue(test.layerCollection);
-    tooltipViewerModule.TooltipViewer = returnValue(test.tooltipViewer);
+    projectionModule.DEBUG_set_Projection(returnValue(test.projection));
+    controlBarModule.DEBUG_set_ControlBar(returnValue(test.controlBar));
+    gestureHandlerModule.DEBUG_set_GestureHandler(returnValue(test.gestureHandler));
+    trackerModule.DEBUG_set_Tracker(returnValue(test.tracker));
+    themeManagerModule.DEBUG_set_BaseThemeManager(returnValue(test.themeManager));
+    dataExchangerModule.DEBUG_set_DataExchanger(returnValue(test.dataExchanger));
+    legendModule.DEBUG_set_LegendsControl(returnValue(test.legendsControl));
+    layoutModule.DEBUG_set_LayoutControl(returnValue(test.layoutControl));
+    mapLayerModule.DEBUG_set_MapLayerCollection(returnValue(test.layerCollection));
+    tooltipViewerModule.DEBUG_set_TooltipViewer(returnValue(test.tooltipViewer));
 }
 export { stubComponentConstructors };