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並前往https://githubmemory.com/repo/timkindberg/jest-when/issues/34

mockReturnValue doesn't work when returning a function

const returnValue = () => 'hello'; const mock1 = jest.fn(); mock1.mockReturnValue(returnValue); expect(mock1('hi')).toBe(returnValue); const mock2 = jest.fn(); ...

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查詢 「mockReturnValue」的人也找了：

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  4. mockImplementation is not a function
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  5. Jest toHaveBeenCalled
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  7. Jest mock class
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  8. Jest beforeEach
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