What are the best practices for testing TypeScript applications?

What are the best practices for testing TypeScript applications?

Some best practices include using Jest for unit tests, leveraging TypeScript's type system, and writing clear test cases.

How do I set up Jest for a TypeScript project?

You can set up Jest by installing it along with ts-jest, then configuring your Jest settings in the package.json or jest.config.js.

Can you give me an example of a simple test case?

Sure! Here's a simple test case:

import { sum } from './math';

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

What about testing asynchronous code?

For asynchronous code, you can use async/await in your tests. Just make sure to return the promise in your test function.