GLSP-1635: Migrate test framework from Mocha to Vitest

- Replace the Mocha/Chai/nyc/Sinon setup with Vitest: consume the
  @eclipse-glsp/dev next packages, drop .mocharc/.nycrc, and point all
  test scripts at `vitest run`
- Drive the whole monorepo from a single flat Vitest config at the repo
  root instead of per-package configs, yielding one merged coverage report
- Type-check specs separately via composite tsconfig.test.json projects,
  since Vitest only transpiles; wire them through a `compile:test` step so
  `pnpm test` type-checks specs before running them
- Import the test API explicitly in every spec (no ambient globals) and
  load reflect-metadata once via root setup files for the DI specs
- Replace the custom expectToThrowAsync helper with Vitest's native
  rejects.toThrow() / toThrow() matchers and drop the obsolete test-util
  module
- Keep test-only code out of the published packages by excluding specs and
  test/ helper directories from both the build and the packed files
- Switch CI and contributor docs to Vitest: run `pnpm test`, and remove the
  now-obsolete test-report step and the redundant per-package and :ci test
  scripts
- Clean up leftover tooling artifacts: ignore *.tsbuildinfo so the new
  per-config build-info is covered, and drop the obsolete nyc/CTRF ignores
  and clean targets
- Declare ts-node directly in the workflow-standalone example, which
  previously relied on it being public-hoisted via the removed
  Mocha/ts-node toolchain

Also:
- Fix indentation in the local /fix skill doc

Part of: eclipse-glsp/glsp#1635

Author: tortmayr

.claude/skills/fix/SKILL.md

@@ -5,8 +5,8 @@ description: Run the fix-and-verify suite for the workspace (compile, auto-fix l
 
 Run the auto-fix and validation suite for the GLSP Client monorepo from the repository root.
 
-1. Build first. This is a hard gate: if the build fails, stop immediately, report the build errors, and do not run any of the following steps. 
-The build must pass before anything else runs. 
+1. Build first. This is a hard gate: if the build fails, stop immediately, report the build errors, and do not run any of the following steps.
+   The build must pass before anything else runs.
 
 ```bash
 pnpm build

.github/workflows/ci.yml

@@ -44,14 +44,7 @@ jobs:
           node-version: 22.x
           cache: pnpm
       - name: Test
-        run: pnpm test:ci
-      - name: Publish Test Report
-        uses: ctrf-io/github-test-reporter@0f299074936c32ccaab5be5230511f6b2b9080aa # v1.0.28
-        with:
-          report-path: 'packages/*/ctrf/*.json'
-          summary-report: true
-          file-report: true
-        if: always()
+        run: pnpm test
   lint:
     name: Lint
     timeout-minutes: 60
@@ -83,7 +76,7 @@ jobs:
           node-version: 22.x
           cache: pnpm
       - name: Run Coverage Tests
-        run: pnpm test:coverage:ci
+        run: pnpm test:coverage
       - name: Upload Coverage Report
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:

.gitignore

@@ -1,5 +1,4 @@
 .idea/
-.nyc_output/
 coverage
 
 node_modules/
@@ -16,10 +15,9 @@ examples/workflow-standalone/app/*
 *.jar
 
 !packages/client/src/lib
-tsconfig.tsbuildinfo
+*.tsbuildinfo
 eslint.xml
 report.xml
-**/ctrf
 examples/workflow-standalone/server
 
 .claude/local.settings.json

.mocharc

@@ -5,47 +5,35 @@
       "type": "node",
       "request": "launch",
       "name": "Run current test",
-      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-      "args": ["--config", "${workspaceRoot}/.mocharc", "--timeout", "0", "${file}"],
+      "autoAttachChildProcesses": true,
+      "skipFiles": ["<node_internals>/**", "**/node_modules/**"],
+      "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "${relativeFile}"],
+      "smartStep": true,
       "console": "integratedTerminal",
-      "internalConsoleOptions": "neverOpen",
-      "env": {
-        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json"
-      }
+      "internalConsoleOptions": "neverOpen"
     },
     {
       "type": "node",
       "request": "launch",
       "name": "Run tests",
-      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-      "args": [
-        "--config",
-        "${workspaceRoot}/.mocharc",
-        "--timeout",
-        "0",
-        "${workspaceFolder}/packages/client/src/**/*.spec.ts"
-      ],
-      "env": {
-        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json"
-      },
+      "autoAttachChildProcesses": true,
+      "skipFiles": ["<node_internals>/**", "**/node_modules/**"],
+      "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "packages/client/src"],
+      "smartStep": true,
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen"
     },
     {
       "type": "node",
       "request": "launch",
       "name": "Run tests (protocol)",
-      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-      "args": [
-        "--config",
-        "${workspaceRoot}/.mocharc",
-        "--timeout",
-        "0",
-        "${workspaceFolder}/packages/protocol/src/**/*.spec.ts"
-      ],
-      "env": {
-        "TS_NODE_PROJECT": "${workspaceFolder}/tsconfig.json"
-      },
+      "autoAttachChildProcesses": true,
+      "skipFiles": ["<node_internals>/**", "**/node_modules/**"],
+      "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "packages/protocol/src"],
+      "smartStep": true,
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen"
     }

.nycrc

@@ -14,7 +14,7 @@ Eclipse GLSP Client monorepo. Provides the sprotty-based client framework for th
 
 ## Validation
 
-- **Tests**: `pnpm test` (Mocha), single test: `pnpm test --grep 'test name'`
+- **Tests**: `pnpm test` (Vitest), single test: `pnpm test -t 'test name'`
 
 ## Inter-Package Import Rules
 

.vscode/launch.json

@@ -12,7 +12,7 @@ Eclipse GLSP Client monorepo. Provides the sprotty-based client framework for th
 
 ## Validation
 
-- **Tests**: `pnpm test` (Mocha), single test: `pnpm test --grep 'test name'`
+- **Tests**: `pnpm test` (Vitest), single test: `pnpm test -t 'test name'`
 - After completing any code changes, always run the `/fix` skill before reporting completion. It auto-fixes lint/format/header issues and runs the tests; manually resolve anything it could not auto-fix (remaining lint errors, test failures) and re-run it.
 
 ## Commenting Style

AGENTS.md

@@ -47,7 +47,9 @@
     "@types/tar": "6.1.5",
     "esbuild": "^0.28.1",
     "inversify": "^6.1.3",
-    "tar": "7.5.16"
+    "tar": "7.5.16",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.9.2"
   },
   "publishConfig": {
     "access": "public"

CLAUDE.md

@@ -7,8 +7,9 @@
     "bundle": "pnpm standalone bundle",
     "bundle:browser": "pnpm standalone bundle:browser",
     "check:all": "pnpm build && pnpm lint && pnpm format:check && pnpm headers:check && pnpm test",
-    "clean": "pnpm -r run clean && rimraf coverage .nyc_output",
+    "clean": "pnpm -r run clean && rimraf coverage *.tsbuildinfo",
     "compile": "tsc -b",
+    "compile:test": "pnpm compile && tsc -b tsconfig.test.json",
     "dev": "pnpm standalone dev",
     "dev:browser": "pnpm standalone dev:browser",
     "dev:mcp": "pnpm standalone dev:mcp",
@@ -29,18 +30,15 @@
     "start:browser": "pnpm standalone start:browser",
     "start:exampleServer": "pnpm standalone start:server",
     "start:mcp": "pnpm standalone start:mcp",
-    "test": "pnpm compile && pnpm -r --no-bail test",
-    "test:ci": "pnpm compile && pnpm -r --no-bail test:ci",
-    "test:coverage": "pnpm compile && pnpm -r test:coverage",
-    "test:coverage:ci": "glsp coverageReport",
+    "test": "pnpm compile:test && vitest run",
+    "test:coverage": "pnpm compile:test && vitest run --coverage",
     "upgrade:next": "glsp updateNext"
   },
   "devDependencies": {
     "@eclipse-glsp/dev": "next",
     "@types/node": "22.x",
     "concurrently": "^9.2.1",
-    "mocha-ctrf-json-reporter": "^0.0.9",
-    "tsconfig-paths": "^4.2.0",
+    "reflect-metadata": "^0.2.2",
     "typescript": "^5.9.2"
   },
   "packageManager": "pnpm@11.7.0",