Question

Is useful when you want to mock functions in certain test cases and restore the original implementation in others.

Answer 1

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.

Answer 2

Answer:

mock reset()

Explanation:

every answer will be in

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