feat(bun-test): add @effect/bun-test package

.changeset/add-effect-bun-test.md

@@ -0,0 +1,5 @@
+---
+"@effect/bun-test": patch
+---
+
+Add the `@effect/bun-test` package: the `@effect/vitest` API (`it.effect`, `it.live`, `layer`, `it.prop`, `flakyTest`, `utils`) on Bun's native `bun:test` runner. Wrapper-managed timeouts abort the synthesized test context's `AbortSignal`, so Effect fibers are interrupted and their finalizers run on timeout.

deno.json

@@ -23,6 +23,7 @@
     "packages/*/benchmark/",
     "packages/ai",
     "packages/atom",
+    "packages/bun-test/",
     "packages/effect/test/cluster/",
     "packages/opentelemetry/",
     "packages/platform/browser/",

packages/bun-test/CHANGELOG.md

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+# @effect/bun-test

packages/bun-test/LICENSE

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+MIT License
+
+Copyright (c) 2023 Effectful Technologies Inc
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/bun-test/README.md

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+# @effect/bun-test
+
+A set of helpers for testing [Effect](https://effect.website) programs with
+Bun's native [`bun:test`](https://bun.sh/docs/cli/test) runner.
+
+The API mirrors [`@effect/vitest`](https://www.npmjs.com/package/@effect/vitest)
+(`it.effect`, `it.live`, `layer`, `it.prop`, `flakyTest`, …) so Effect test
+suites move between the two runners without rewrites.
+
+## Installation
+
+```sh
+bun add -d @effect/bun-test
+```
+
+## Usage
+
+```ts
+import { assert, describe, expect, it, layer } from "@effect/bun-test"
+import { Context, Effect, Layer } from "effect"
+
+class Foo extends Context.Service<Foo, "foo">()("Foo") {
+  static layer = Layer.succeed(Foo)("foo")
+}
+
+it.effect("plain effect test", () => Effect.sync(() => expect(1).toEqual(1)))
+
+layer(Foo.layer)("with a shared layer", (it) => {
+  it.effect("has Foo in context", () =>
+    Effect.gen(function*() {
+      const foo = yield* Foo
+      assert.strictEqual(foo, "foo")
+    }))
+})
+```
+
+Run with:
+
+```sh
+bun test
+```
+
+## Timeouts interrupt fibers
+
+Bun's own test timeout fails the test but cannot stop the Effect running
+behind it, so finalizers would never run. The wrapper owns the timeout
+instead: when it fires, the test context's `AbortSignal` aborts, the Effect
+fiber is interrupted, and its finalizers run — Bun keeps a slightly larger
+timeout as a backstop.
+
+## Differences from `@effect/vitest`
+
+- **`addEqualityTesters`** is a no-op — `bun:test`'s `expect` does not expose
+  `addEqualityTesters`. Compare `Equal` values with `Equal.equals` or the
+  helpers in `@effect/bun-test/utils`.
+- **`TestContext`** — Bun doesn't pass a context object to test functions, so
+  the wrapper synthesises one (`signal`, `onTestFinished`, `onTestFailed`).
+- **`assert`** — Vitest re-exports chai's `assert`; this package ships a small
+  compatible subset built on `node:assert`.

packages/bun-test/bunfig.toml

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+[test]
+root = "./test"

packages/bun-test/package.json

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+{
+  "name": "@effect/bun-test",
+  "version": "4.0.0-rc.112",
+  "type": "module",
+  "license": "MIT",
+  "description": "A set of helpers for testing Effects with Bun's native bun:test runner",
+  "homepage": "https://effect.website",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Effect-TS/effect.git",
+    "directory": "packages/bun-test"
+  },
+  "bugs": {
+    "url": "https://github.com/Effect-TS/effect/issues"
+  },
+  "sideEffects": [],
+  "exports": {
+    "./package.json": "./package.json",
+    ".": "./src/index.ts",
+    "./*": "./src/*.ts",
+    "./internal/*": null,
+    "./index": null,
+    "./*/index": null
+  },
+  "files": [
+    "src/**/*.ts",
+    "dist/**/*.js",
+    "dist/**/*.js.map",
+    "dist/**/*.d.ts",
+    "dist/**/*.d.ts.map",
+    "AGENTS.md",
+    "CLAUDE.md",
+    "ai-docs/**/*"
+  ],
+  "publishConfig": {
+    "access": "public",
+    "provenance": true,
+    "exports": {
+      "./package.json": "./package.json",
+      ".": "./dist/index.js",
+      "./*": "./dist/*.js",
+      "./internal/*": null,
+      "./index": null,
+      "./*/index": null
+    }
+  },
+  "scripts": {
+    "build": "tsc -b tsconfig.json && pnpm babel",
+    "babel": "babel dist --plugins annotate-pure-calls --out-dir dist --source-maps",
+    "check": "tsc -b tsconfig.json",
+    "test": "bun test"
+  },
+  "peerDependencies": {
+    "effect": "workspace:^"
+  },
+  "devDependencies": {
+    "@types/bun": "^1.3.4",
+    "effect": "workspace:^"
+  }
+}