chore: init unit tests

.github/pull_request_template.md

@@ -1,5 +1,6 @@
 ### Checklist
 - [ ] Version number incremented in `package.json`
+- [ ] Unit tests are passing
 
 ### Changes
 <!-- Brief description of changes -->

.github/workflows/run-tests.yml

@@ -0,0 +1,32 @@
+name: Run Jest tests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        app:
+          - dev
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    # setting up node.js
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '20.x'
+
+    - run: npm ci --save-dev
+    - run: npm test

.gitignore

@@ -17,4 +17,7 @@ lerna-debug.log*
 .vscode/*
 !.vscode/extensions.json
 .idea
-.DS_Store
+.DS_Store
+
+# Unit tests
+coverage