Add GH Action for running tests (#859)

Author: leebyron

.github/workflows/test.yml

@@ -0,0 +1,9 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  test:
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+      - run: npm ci
+      - run: npm test