1. Create project and install libraries

$npm init -y
$npm install -D jest supertest
$npm install -S express

2. Config test and run test

Edit file package.json

"scripts": {
    "test": "jest --coverage"
}

Run test

$npm test

3. Create test file user.test.js

• Generate by AI with Sample prompts

Fix your test with AI

• Create file ./app.js with express library

Run test again !!

$npm test

4. Start server

$node server.js

List of urls

• http://localhost:3000/users/1
• http://localhost:3000/users/2
• http://localhost:3000/users/3

More ...

• Add health check GET /healthz
• Get user data from postgresql database