Mock Functions

Mock Functions

Mock functions are also known as "spies", because they let you spy on the behavior of a function that is called indirectly by some other code, rather than just testing the output. You can create a mock function with jest.fn(). If no implementation is given, the mock function will return undefined when invoked.

Methods

• mockFn.mock.calls
• mockFn.mock.instances
• mockFn.mockClear()
• mockFn.mockReset()
• mockFn.mockRestore()
• mockFn.mockImplementation(fn)
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