How can I use Jest for mocking in my tests?

How can I use Jest for mocking in my tests?

You can use Jest's built-in mocking functions like jest.mock() to mock modules and functions in your tests.

Can you show me an example of mocking a function?

Sure! Here's a simple example:

const myFunction = jest.fn();
myFunction.mockReturnValue('mocked value');
console.log(myFunction()); // Outputs: mocked value

What about mocking a module?

To mock a module, you can use jest.mock('moduleName'). For example:

jest.mock('./myModule');
import myModule from './myModule';
myModule.mockImplementation(() => 'mocked implementation');

Are there any best practices for mocking?

Yes! Keep your mocks simple, avoid mocking too much, and ensure your tests remain readable and maintainable.