Add test workflow

Author: jpalumickas

.github/workflows/test.yml

@@ -0,0 +1,21 @@
+name: Test
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js v12
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+    - name: Test
+      run: |
+        yarn install
+        yarn build
+        yarn test
+      env:
+        CI: true