Add testing / coverage

Author: ashubham

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Test and Send Coverage to Coveralls
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  test-and-coveralls:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests with coverage
+        run: npm run test -- --coverage
+
+      - name: Upload coverage to Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: ./coverage/lcov.info