ci: add the "Test" GitHub Actions workflow

.github/workflows/test.yml

@@ -0,0 +1,46 @@
+name: Test
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  linux:
+    name: "Node ${{ matrix.node }} on Linux: Test and Lint"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node:
+          - 10
+          - 12
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: browser-actions/setup-chrome@latest
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+      - run: npm ci
+      - run: npm run test
+  windows:
+    name: "Node ${{ matrix.node }} on Windows: Test and Lint"
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      matrix:
+        node:
+          - 10
+          - 12
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+      - run: npm ci
+      - run: npm run test