Add test workflow and update package.json

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: Test
+
+on:
+  push:
+    branches: [ test ]
+  pull_request:
+    branches: [ test ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [21.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm ci
+    - run: npm run build --if-present
+    - run: npm run test:ci

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "build": "tsc",
     "test": "jest --watchAll",
+    "test:ci": "jest",
     "prepare": "npm run build && npm run test",
     "version": "git add -A src",
     "postversion": "git push && git push --tags"