ci: add code coverage with 80% line threshold

Add test:coverage npm script using Node.js built-in test coverage
with --test-coverage-lines=80 threshold. Excludes thin VS Code API
wrapper files (extension.ts, statusBar.ts, configureMcp.ts,
setupWorkspace.ts, showStatus.ts) that are tested by integration
tests rather than unit tests.

Add coverage check step to CI workflow (Linux-only in unit-test job).
Include coverage in the npm run check gate.

Current coverage: 82.65% line, 86.27% branch, 86.69% function.

Closes #61

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>

Author: SebTardif

.github/workflows/ci.yml

@@ -38,6 +38,10 @@ jobs:
       - name: Run tests
         run: npm test
 
+      - name: Check code coverage
+        if: matrix.os == 'ubuntu-latest'
+        run: npm run test:coverage
+
   build:
     runs-on: ubuntu-latest
     timeout-minutes: 10

AGENTS.md

@@ -16,8 +16,9 @@ Patchloom for VS Code is the official VS Code extension for [Patchloom](https://
 | `npm run test:ui` | Run ExTester UI tests (downloads VS Code if needed) |
 | `npm run test:all` | Compile + unit tests + extension integration tests |
 | `npm run test` | Compile + compile-tests + unit tests |
+| `npm run test:coverage` | Unit tests with line coverage (80% threshold) |
 | `npm run package` | Package the `.vsix` using `@vscode/vsce` |
-| `npm run check` | Full CI gate: test + package |
+| `npm run check` | Full CI gate: test + coverage + package |
 
 Always run `npm run check` before committing.
 

package.json

@@ -140,13 +140,14 @@
     "compile-uitests": "tsc -p ./tsconfig.uitest.json",
     "watch": "tsc -watch -p ./",
     "test:unit": "node --test ./out-test/test/unit/*.test.js",
+    "test:coverage": "node --test --experimental-test-coverage --test-coverage-lines=80 --test-coverage-exclude='out-test/src/extension*' --test-coverage-exclude='out-test/src/commands/showStatus*' --test-coverage-exclude='out-test/src/commands/configureMcp*' --test-coverage-exclude='out-test/src/commands/setupWorkspace*' --test-coverage-exclude='out-test/src/status/statusBar*' ./out-test/test/unit/*.test.js",
     "test:extension": "node ./out-test/test/suite/runExtensionTests.js",
     "test:ui": "npm run compile && npm run compile-uitests && extest setup-and-run './out-uitest/test/ui/*.test.js' --code_version max --extensions_dir .vscode-test/extensions",
     "test": "npm run compile && npm run compile-tests && npm run test:unit",
     "test:all": "npm run compile && npm run compile-tests && npm run test:unit && npm run test:extension",
     "vscode:prepublish": "npm run compile",
     "package": "vsce package",
-    "check": "npm run test && npm run package"
+    "check": "npm run test && npm run test:coverage && npm run package"
   },
   "overrides": {
     "mocha": {