How do I use Jest for testing my JavaScript code?

How do I use Jest for testing my JavaScript code?

Jest is a delightful JavaScript testing framework. You can start by installing it via npm with npm install --save-dev jest. Then, create a test file with a .test.js extension.

What are some basic commands I should know?

You can run tests using npm test, and to watch for changes, use npm test -- --watch. Jest also supports running specific tests.

Can I test asynchronous code with Jest?

Yes, Jest has built-in support for testing asynchronous code. You can use async/await or return a promise in your tests.

What about mocking functions?

Jest provides a powerful mocking library. You can use jest.fn() to create a mock function and jest.mock() to mock modules.