add test to github workflow

Author: gkwang

.github/workflows/test.yml

@@ -0,0 +1,44 @@
+name: Build and Test
+
+on:
+  merge_group:
+  workflow_dispatch:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/master' }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [ 12, 14, 16, 18 ]
+    name: Node ${{ matrix.node }} Test
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.ref }}
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install --build-from-source
+
+      - name: Run Jest unit tests
+        run: npm run test