test: run tests on MCP server inside Docker (#361)

https://github.com/microsoft/playwright-mcp/issues/346

.github/workflows/ci.yml

@@ -30,32 +30,56 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
-
     steps:
     - uses: actions/checkout@v4
-
     - name: Use Node.js 18
       uses: actions/setup-node@v4
       with:
         # https://github.com/microsoft/playwright-mcp/issues/344
         node-version: '18.19'
         cache: 'npm'
-
     - name: Install dependencies
       run: npm ci
-
     - name: Playwright install
       run: npx playwright install --with-deps
-
     - name: Install MS Edge
-      if: ${{ matrix.os == 'macos-latest' }} # MS Edge is not preinstalled on macOS runners.
+      # MS Edge is not preinstalled on macOS runners.
+      if: ${{ matrix.os == 'macos-latest' }}
       run: npx playwright install msedge
-
     - name: Build
       run: npm run build
-
-    - name: Install Playwright browsers
-      run: npx playwright install --with-deps
-
     - name: Run tests
-      run: npm test -- --forbid-only
+      run: npm test
+
+  test_docker:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js 18
+      uses: actions/setup-node@v4
+      with:
+        node-version: '18'
+        cache: 'npm'
+    - name: Install dependencies
+      run: npm ci
+    - name: Playwright install
+      run: npx playwright install --with-deps chromium
+    - name: Build
+      run: npm run build
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Build and push
+      uses: docker/build-push-action@v6
+      with:
+        tags: playwright-mcp-dev:latest
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+        load: true
+    - name: Run tests
+      shell: bash
+      run: |
+        # Used for the Docker tests to share the test-results folder with the container.
+        umask 0000
+        npm run test -- --project=chromium-docker
+      env:
+        MCP_IN_DOCKER: 1