Adds unit tests to github actions

.github/workflows/unit-test.yml

@@ -0,0 +1,25 @@
+name: unit-test
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '18'
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Run unit tests
+      run: npm test