Run fidelity tests in Github Actions

.github/workflows/fidelity-tests.yml

@@ -0,0 +1,44 @@
+name: Fidelity tests
+
+on: [pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+
+    - name: Get npm cache directory
+      id: npm-cache
+      run: |
+        echo "::set-output name=dir::$(npm config get cache)"
+
+    - name: Cache npm packages
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.npm-cache.outputs.dir }}
+        key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-npm-
+
+    - name: NPM install
+      run: npm ci
+
+    - name: Lint TypeScript sources
+      run: npm run lint
+
+    - name: Bootstrap packages
+      run: npm run bootstrap
+
+    - name: Build packages
+      run: npm run build
+
+    - name: Fidelity tests
+      uses: GabrielBB/xvfb-action@v1.0
+      run: |
+        cd ./packages/render-fidelity-tools
+        npm run test