Update nodejs.yml

.github/workflows/nodejs.yml

@@ -20,3 +20,25 @@ jobs:
       run: |
         yarn install
         yarn build
+  test:
+    name: Test on node ${{ matrix.node_version }} and ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node_version: [8, 10, 12]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node_version }}
+      uses: actions/setup-node@v1
+      with:
+        version: ${{ matrix.node_version }}
+
+    - name: Use Yarn 1.17.2
+      run: |
+        npm install -g yarn@1.17.2    
+    - name: yarn build
+      run: |
+        yarn install
+        yarn build