[GH actions] Test on pull requests (#5)

* created pr-test.yml

Author: andreiduca

.github/workflows/pr-test.yml

@@ -0,0 +1,21 @@
+name: PR test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Run tests
+        run: yarn test