feat: enable code coverage

Fixes #613

Hitting mocha timeout creates false coverage reports,
that leads to `c8` reporting false statistics.

Author: gnikit

.github/workflows/main.yaml

@@ -25,3 +25,31 @@ jobs:
         uses: GabrielBB/xvfb-action@v1
         with:
           run: npm test
+
+  coverage:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node-version: [18.x]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Installing Extension
+        run: npm ci
+
+      - name: Coverage report
+        uses: GabrielBB/xvfb-action@v1
+        with:
+          run: npm run coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true

.nycrc

@@ -0,0 +1,6 @@
+{
+  "all": true,
+  "include": ["out/**/*.js"],
+  "exclude": ["**/node_modules/**", "out/test/**"],
+  "reporter": ["html", "text", "lcov"]
+}

.prettierignore

@@ -2,5 +2,6 @@
 
 node_modules
 .vscode-test
+coverage
 dist
 out