add test

Author: John B

.github/workflows/test.yml

@@ -0,0 +1,15 @@
+name: Test Package
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 13
+      - run: yarn
+      - run: yarn build
+      - run: yarn test