chore: migrate test framework from Jest to Vitest 4.0.15

Replace Jest with Vitest for improved ESM compatibility and faster execution

Key changes:
- Remove jest, @jest/globals, @types/jest, ts-jest → install vitest 4.0.15
- Convert all test files: jest.fn() → vi.fn(), jest.spyOn() → vi.spyOn()
- Convert vscode module mock from CommonJS to ESM
- Add vitest.config.ts and tsconfig.test.json
- Create vitest.d.ts for global type declarations (vi, describe, it, etc.)
- Update package.json scripts and launch.json debug configuration
- Remove Jest references from docs (CLAUDE.md, .vscodeignore, etc.)

Author: kubrickcode

.gemini/styleguide.md

@@ -154,7 +154,7 @@ _Function placement in functional files:_
 
 **Recommended libraries**
 
-- Testing: Jest, Playwright
+- Testing: Vitest, Playwright
 - Utility: es-toolkit, dayjs
 - HTTP: ky, @tanstack/query, @apollo/client
 - Form: React Hook Form
@@ -229,15 +229,15 @@ Allow multiple related assertions in one test, but separate tests when verifying
 
 ### Test Framework
 
-Use Jest. Maintain consistency within project.
+Use Vitest. Maintain consistency within project.
 
 ### Structuring
 
 Group methods/features with `describe`, write individual cases with `it`. Can classify scenarios with nested `describe`.
 
 ### Mocking
 
-Utilize Jest's `jest.mock()`, `jest.spyOn()`. Mock external modules at top level, use `mockReturnValue`, `mockImplementation` for per-test behavior changes.
+Utilize Vitest's `vi.mock()`, `vi.spyOn()`. Mock external modules at top level, use `mockReturnValue`, `mockImplementation` for per-test behavior changes.
 
 ### Async Tests
 

.vscode/launch.json

@@ -21,9 +21,9 @@
       "name": "Extension Tests",
       "type": "node",
       "request": "launch",
-      "program": "${workspaceFolder}/node_modules/jest/bin/jest",
-      "cwd": "${workspaceFolder}",
-      "args": ["--runInBand", "--config", "src/extension/jest.config.cjs"],
+      "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs",
+      "cwd": "${workspaceFolder}/src/extension",
+      "args": ["run"],
       "console": "integratedTerminal"
     }
   ]

.vscodeignore

@@ -12,7 +12,7 @@ src/global.d.ts
 
 # Extension development files
 src/extension/tsconfig.json
-src/extension/jest.config.cjs
+src/extension/vitest.config.ts
 src/extension/.gitignore
 src/extension/.npmrc
 src/extension/pnpm-lock.yaml

CLAUDE.md

@@ -55,7 +55,7 @@ Quick Command Buttons is a VS Code extension that adds customizable command butt
 cd src/extension
 npm run compile      # Compile TypeScript
 npm run lint         # Run ESLint
-npm run test         # Run Jest tests
+npm run test         # Run Vitest tests
 npm run test:watch   # Run tests in watch mode
 npm run test:coverage # Generate coverage report
 npm run test:ci      # CI test mode
@@ -169,7 +169,7 @@ React-based configuration UI with:
 ## Testing Strategy
 
 - **Unit tests**: All manager/provider classes have `.spec.ts` files (co-located)
-- **Test framework**: Jest with TypeScript support
+- **Test framework**: Vitest with TypeScript support
 - **Mocking**: VS Code API mocked via `adapters` layer
 - **Coverage**: Use `test:coverage` for reports
 

package.json

@@ -365,24 +365,23 @@
     "test": "turbo run test --filter=quick-command-buttons-extension",
     "test:ci": "turbo run test:ci --filter=quick-command-buttons-extension",
     "test:coverage": "turbo run test:coverage --filter=quick-command-buttons-extension",
-    "test:watch": "cd src/extension && jest --watch",
+    "test:watch": "cd src/extension && vitest",
     "test:e2e-ui": "cd src/view && pnpm test:e2e-ui",
     "test:e2e-ui:report": "cd src/view && pnpm test:e2e-ui:report",
     "vsce-publish": "vsce publish --no-dependencies"
   },
   "devDependencies": {
     "@eslint/js": "9.17.0",
-    "@jest/globals": "30.1.2",
     "@semantic-release/changelog": "6.0.3",
     "@semantic-release/commit-analyzer": "13.0.0",
     "@semantic-release/exec": "7.1.0",
     "@semantic-release/git": "10.0.1",
     "@semantic-release/github": "11.0.1",
     "@semantic-release/npm": "13.1.2",
     "@semantic-release/release-notes-generator": "14.1.0",
-    "@types/jest": "30.0.0",
     "@types/node": "24.3.0",
     "@types/vscode": "1.90.0",
+    "@vitest/coverage-v8": "4.0.15",
     "@vscode/vsce": "3.7.1",
     "conventional-changelog-conventionalcommits": "9.1.0",
     "esbuild": "0.27.0",
@@ -391,15 +390,14 @@
     "eslint-plugin-perfectionist": "4.15.1",
     "globals": "16.5.0",
     "husky": "9.1.7",
-    "jest": "30.1.3",
     "lint-staged": "16.2.7",
     "ovsx": "0.10.7",
     "prettier": "3.6.2",
     "semantic-release": "25.0.2",
-    "ts-jest": "29.4.1",
     "turbo": "2.6.1",
     "typescript": "5.8.3",
-    "typescript-eslint": "8.46.0"
+    "typescript-eslint": "8.46.0",
+    "vitest": "4.0.15"
   },
   "dependencies": {
     "es-toolkit": "1.42.0",