medium10 pts · first answer countstest-automationjesttest-isolation

A mock leaking into other tests

One test does jest.spyOn(Date, "now").mockReturnValue(0). Later tests in the file start failing on dates. What is the cleanest fix?

A.Restore spies after each test, e.g. with jest.restoreAllMocks()B.Move the test that mocks Date.now to the very end of the fileC.Mock Date.now in every test so that they all behave the sameD.Run each test file twice so that the mock wears off by itself

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A mock leaking into other tests

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