add unit test

Author: dgrelaud

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest]
+        node: [20, 22, 24, 25]
+    name: Node ${{ matrix.node }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+      - run: npm install
+      - run: npm test