yanglint: Add commands for sample skeleton generation and IETF validation

tests/yanglint/interactive/sample-skeleton.test

@@ -0,0 +1,96 @@
+source [expr {[info exists ::env(TESTS_DIR)] ? "$env(TESTS_DIR)/interactive/ly.tcl" : "ly.tcl"}]
+
+test print_yang {} {
+-setup $ly_setup -cleanup $ly_cleanup -body {
+    ly_cmd "load modleaf"
+    ly_cmd "print -f yang modleaf" "leaf lfl"
+}}
+
+test skeleton_generate_xml {Test generating xml skeleton to stdout and to file} {
+-setup $ly_setup -cleanup $ly_cleanup -body {
+    set pattern "(?s)^"
+    append pattern {.*<main-box xmlns="urn:ietf:params:xml:ns:yang:skeleton-complex">}
+    append pattern {.*<empty-leaf/>}
+    append pattern {.*<bool-leaf>true</bool-leaf>}
+    append pattern {.*<num32-leaf>-100</num32-leaf>}
+    append pattern {.*<num64-leaf>9999999999</num64-leaf>}
+    append pattern {.*<str-leaf>hello</str-leaf>}
+    append pattern {.*<ll-empty></ll-empty>}
+    append pattern {.*<ll-numbers>10</ll-numbers>}
+    append pattern {.*<ll-numbers>20</ll-numbers>}
+    append pattern {.*<a-leaf/>}
+    append pattern {.*<c2-leaf>default-choice-val</c2-leaf>}
+    append pattern {.*<server-list>}
+    append pattern {.*<id/>}
+    append pattern {.*<config>}
+    append pattern {.*<ip/>}
+    append pattern {.*</config>}
+    append pattern {.*</server-list>}
+    append pattern {.*<custom-data/>}
+    append pattern {.*<custom-xml/>}
+    append pattern {.*<aug-leaf xmlns="urn:ietf:params:xml:ns:yang:skeleton-augment">augmented-value</aug-leaf>}
+    append pattern {.*<aug-ll xmlns="urn:ietf:params:xml:ns:yang:skeleton-augment">1</aug-ll>}
+    append pattern {.*<aug-ll xmlns="urn:ietf:params:xml:ns:yang:skeleton-augment">2</aug-ll>}
+    append pattern {.*</main-box>}
+    append pattern ".*"
+
+    ly_cmd "load skeleton"
+    ly_cmd "load skeleton-augment"
+    ly_cmd "sample -f xml skeleton" $pattern
+
+    ly_cmd "sample -f xml -o test_output.xml skeleton"
+
+    if {![file exists "test_output.xml"]} {
+        error "Test failed: yanglint did not create 'test_output.xml'!"
+    }
+
+    set fp [open "test_output.xml" r]
+    set file_data [read $fp]
+    close $fp
+
+    if {![regexp $pattern $file_data]} {
+        error "Test failed: The file content did not match!\nFile contained:\n$file_data"
+    }
+
+    file delete "test_output.xml"
+}}
+
+test skeleton_generate_json {} {
+-setup $ly_setup -cleanup $ly_cleanup -body {
+    set pattern "(?s)^"
+    append pattern {.*"skeleton:main-box": \{}
+    append pattern {.*"empty-leaf": \[null\],}
+    append pattern {.*"bool-leaf": true,}
+    append pattern {.*"num32-leaf": -100,}
+    append pattern {.*"num64-leaf": "9999999999",}
+    append pattern {.*"str-leaf": "hello",}
+    append pattern {.*"ll-empty": \[\],}
+    append pattern {.*"ll-numbers": \[}
+    append pattern {.*10,}
+    append pattern {.*20}
+    append pattern {.*],}
+    append pattern {.*"a-leaf": null,}
+    append pattern {.*"c2-leaf": "default-choice-val",}
+    append pattern {.*"server-list": \[}
+    append pattern {.*\{}
+    append pattern {.*"id": null,}
+    append pattern {.*"config": \{}
+    append pattern {.*"ip": null}
+    append pattern {.*\}}
+    append pattern {.*\}}
+    append pattern {.*\],}
+    append pattern {.*"custom-data": \{\},}
+    append pattern {.*"custom-xml": \{\},}
+    append pattern {.*"skeleton-augment:aug-leaf": "augmented-value",}
+    append pattern {.*"skeleton-augment:aug-ll": \[}
+    append pattern {.*1,}
+    append pattern {.*2}
+    append pattern {.*\]}
+    append pattern {.*\}}
+    append pattern ".*"
+
+    ly_cmd "load skeleton"
+    ly_cmd "load skeleton-augment"
+
+    ly_cmd "sample -f json skeleton" $pattern
+}}

tests/yanglint/modules/bad-ietf-prefix-namespace.yang

@@ -0,0 +1,26 @@
+module bad-ietf-prefix-namespace {
+  yang-version 1.1;
+  namespace "urn:wrong:namespace";
+  prefix bpn;
+
+  organization "IETF NETMOD Working Group";
+  contact "WG Web: <https://datatracker.ietf.org/wg/netmod/>";
+
+  description
+    "Copyright (c) 2026 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Revised BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC XXXX; see
+     the RFC itself for full legal notices.";
+
+  revision 2026-07-08 {
+    // Triggers 4.8: Missing "reference" and "description" inside the revision block
+  }
+}

tests/yanglint/modules/ietf-bad-boilerplate.yang

@@ -0,0 +1,19 @@
+module ietf-bad-boilerplate {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-bad-boilerplate";
+  prefix ibb;
+
+  organization "IETF NETMOD Working Group";
+  contact "WG Web: <https://datatracker.ietf.org/wg/netmod/>";
+
+  // 1. Missing IETF Trust Copyright (Triggers 3.1)
+  // 2. Missing "This version of this YANG module is part of RFC..." (Triggers Appendix B)
+  // 3. Uses the word "MUST", but lacks the RFC 8174 text block (Triggers BCP 14 check)
+  description
+    "This module MUST intentionally fail the text boilerplate checks.";
+
+  revision 2026-07-08 {
+    description "Initial revision.";
+    reference "RFC XXXX: Test Module";
+  }
+}

tests/yanglint/modules/ietf-correct.yang

@@ -0,0 +1,60 @@
+module ietf-correct {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-correct";
+  prefix isc;
+
+  organization
+    "IETF NETMOD Working Group";
+
+  contact
+    "WG Web:   <https://datatracker.ietf.org/wg/netmod/>";
+
+  description
+    "Copyright (c) 2026 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Revised BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC XXXX; see
+     the RFC itself for full legal notices.";
+
+  revision 2026-07-08 {
+    description
+      "Initial revision.";
+    reference
+      "RFC XXXX: Test Module";
+  }
+
+  container system-info {
+    description
+      "A simple top-level container to hold our data. Notice it is
+       not mandatory.";
+
+    leaf system-name {
+      type string;
+      description
+        "The configured name of the system.";
+    }
+
+    leaf status {
+      type enumeration {
+        enum active {
+          description
+            "The system is currently active and processing.";
+        }
+        enum inactive {
+          description
+            "The system is currently inactive.";
+        }
+      }
+      description
+        "The current operational status of the system. Notice there
+         is no explicit 'config true' or 'mandatory false' here.";
+    }
+  }
+}

tests/yanglint/modules/ietf-defaults-and-mandatory.yang

@@ -0,0 +1,66 @@
+module ietf-defaults-and-mandatory {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-defaults-and-mandatory";
+  prefix idm;
+
+  organization "IETF NETMOD Working Group";
+  contact "WG Web: <https://datatracker.ietf.org/wg/netmod/>";
+  description
+    "Copyright (c) 2026 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Revised BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC XXXX; see
+     the RFC itself for full legal notices.";
+
+  revision 2026-07-08 {
+    description "Initial revision.";
+    reference "RFC XXXX: Test Module";
+  }
+
+  extension ext1 {
+    description "Ext description";
+    argument arg1 {
+      // Triggers 4.4: yin-element given with default
+      yin-element false;
+    }
+  }
+
+  // Triggers 4.10: Top-level node cannot be mandatory
+  leaf top-mand-leaf {
+    type string;
+    description "Top level mandatory";
+    mandatory true;
+  }
+
+  leaf bad-defaults-leaf {
+    type string;
+    description "Leaf with explicit defaults";
+    // Triggers 4.4: config true
+    config true;
+    // Triggers 4.4: status current
+    status current;
+    // Triggers 4.4: mandatory false
+    mandatory false;
+  }
+
+  list bad-list {
+    key "k";
+    description "List with explicit defaults";
+    ordered-by system;
+    leaf k {
+      type string;
+      description "Key";
+    }
+    // Triggers 4.4: min-elements 0
+    min-elements 0;
+    // Triggers 4.4: max-elements unbounded
+    max-elements unbounded;
+  }
+}

tests/yanglint/modules/ietf-empty-type.yang

@@ -0,0 +1,62 @@
+module ietf-empty-type {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-empty-type";
+  prefix eett;
+
+  organization
+    "IETF NETMOD (Network Modeling) Working Group";
+
+  contact
+    "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
+     WG List:  <mailto:netmod@ietf.org>
+
+     Author:   Test Author
+               <mailto:test@example.com>";
+
+  description
+    "Copyright (c) 2026 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Revised BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC XXXX; see
+     the RFC itself for full legal notices.";
+
+  revision 2026-07-10 {
+    description
+      "Initial revision. Testing empty types in keys and leaf-lists.";
+    reference
+      "RFC XXXX: Guidelines for Authors and Reviewers of YANG Data Models";
+  }
+
+  container top-container {
+    description
+      "A top level container to hold our test lists.";
+
+    /* TEST 1: Trigger the 'empty' type in list key warning */
+    list list-with-empty-key {
+      key "id";
+      description
+        "A list to test the empty key warning.";
+
+      /* TEST 2: Trigger the 'empty' type in leaf */
+      leaf id {
+        type empty;
+        description
+          "Key leaf of type empty.";
+      }
+    }
+
+    /* TEST 3: Trigger the 'empty' type in leaf-list warning */
+    leaf-list leaf-list-with-empty-type {
+      type empty;
+      description
+        "A leaf-list to test the empty type warning.";
+    }
+  }
+}