add unit test workflow

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+name: Test
+
+on:
+  pull_request:
+    types: [opened, reopened]
+  push:
+
+jobs:
+  build:
+    name: Tests
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.6.0
+          run_install: false
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "pnpm"
+      - name: Install Dependencies
+        run: pnpm install
+      - name: Test with Vitest
+        run: pnpm test