feat: Implement testing framework with Vitest and JSDOM

.github/workflows/code-quality.yml

@@ -1,4 +1,4 @@
-name: Code Quality Check
+name: Code Quality & Tests # Keeping this name as it accurately reflects both jobs
 
 on:
   push:
@@ -7,21 +7,27 @@ on:
     branches: [main]
 
 jobs:
-  lint:
+  code-quality: # Renamed job
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Setup Biome
+        uses: biomejs/setup-biome@v2
+        with:
+          version: latest # Or a specific version
+      - name: Run Biome Check # Consolidated lint and format check
+        run: biome check ./src # This command checks both linting and formatting
 
+  test:
+    runs-on: ubuntu-latest
+    needs: code-quality # Depends on the renamed job
+    steps:
+      - uses: actions/checkout@v4
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v3
         with:
-          node-version: "22"
-          cache: "npm"
-
+          node-version: '18'
       - name: Install dependencies
         run: npm ci
-
-      - name: Run linting check
-        run: npm run lint:check
-      - name: Check formatting (Prettier)
-        run: npm run format:check
+      - name: Run tests
+        run: npm test

README.md

@@ -299,6 +299,15 @@ This project uses a combination of tools for code formatting and linting to ensu
 
 These formatting checks are automatically enforced in the CI pipeline (see `.github/workflows/code-quality.yml`) to maintain code quality.
 
+## Running Tests
+
+This project uses [Vitest](https://vitest.dev/) for unit testing. To run the tests, use the following npm scripts:
+
+- `npm test`: Runs the tests once.
+- `npm run test:watch`: Runs the tests in watch mode, automatically re-running them when files change.
+
+Ensure you have installed the development dependencies by running `npm install` before executing the tests.
+
 ## License
 
 MIT