In this case, mockFn has been called twice, to fix this, we should clear the mock. If you create Jest mocks that exist outside the scope of a single test like either of the module mocks discussed above, it is worth noting that the jest.mock object associated with those mocks is not cleared between test runs unless explicitly done so in an afterEach method or with the clearMocks config options. This is useful when you want to completely reset a mock back to its initial state. Does everything that mockFn.mockClear () does, and also removes any mocked return values or implementations. The clearMocks configuration option is available to clear mocks automatically between tests. Is there a way to clear mocks between tests? The first assertion expects that the axios.request () method was called, while the second assertion checks that the method was called with the correct parameters. In our test case, we call the getPhotosByAlbumId () function with an ID of 3 as the argument. We’ve just seen the clearAllMocks definition as per the Jest docs, here’s the mockReset () definition: Does everything that mockFn.mockClear () does, and also removes any mocked return values or implementations. Another tool inside a Jest mock is the ability to switch out your entire method implementation. To test the callback is receiving the value from our mocked util function, we need to configure the doUtilWithValue mock to return a value. In other words, it will replace the mock function with a new jest. A superset of clearAllMocks() which also takes care of resetting the implementation to a no return function.
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