fix: update dependencies, add tests, and improve validation

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Test
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test

.gitignore

@@ -39,6 +39,7 @@ yarn-error.log
 # Ignore coverage and test reports
 .coverage
 coverage.xml
+coverage/
 *.cover
 *.pyc