How do I set up Jest for testing my Node.js application?

How do I set up Jest for testing my Node.js application?

To set up Jest, first install it using npm: npm install --save-dev jest. Then, add a test script in your package.json.

What should I include in my package.json for Jest?

In your package.json, add a "test" script like this: "test": "jest". This allows you to run tests using npm test.

How do I create a simple test case?

Create a __tests__ folder, then add a file like app.test.js. Inside, use test('description', () => { /* test code */ });.

Can I test asynchronous code with Jest?

Yes! Use async/await or return a promise in your test function to handle asynchronous code.