Create test.yml (#101)

Workflow actions to run tests against Node.js versions 10, 12, and latest (corresponding to "engines" in package.json)

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  full:
+    name: Node.js Test Suite
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10, 12, '*']
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+      - name: Install Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install dependencies
+        run: npm install
+      - name: Run tests
+        run: npm test