Setup GitHub action for running tests (#39)

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: Node CI
+
+on: [push]
+
+jobs:
+  build:
+    timeout-minutes: 20
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js 12
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Install dependencies
+        run: yarn
+
+      - name: Test
+        run: yarn test

package.json

@@ -13,7 +13,8 @@
   },
   "scripts": {
     "build": "parcel build ./src/index.ts --no-source-maps --target=node --bundle-node-modules",
-    "test:watch": "jest --watch"
+    "test": "jest",
+    "test:watch": "yarn test --watch"
   },
   "dependencies": {
     "@actions/core": "^1.2.4",