How do I set up mocks in Jest?

How do I set up mocks in Jest?

To set up mocks in Jest, you can use jest.mock() to mock modules or functions. What specific part do you need help with?

Can you show me an example of mocking a function?

Sure! You can mock a function like this: jest.mock('./myModule', () => ({ myFunction: jest.fn() }));. This replaces myFunction with a mock function.

How do I assert that a mock function was called?

You can use expect(myFunction).toHaveBeenCalled() to assert that the mock function was called during the test.

What if I want to mock a return value?

You can set a return value using myFunction.mockReturnValue(value) to specify what the mock should return.