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並前往https://www.salto.io/blog/typescript-unit-testing-pitfalls-with-jest-and-how-to-work-around-them

Typescript unit testing pitfalls with Jest - Salto

mockReturnValue (true). result = predicateOrZero(10, mockPredicate). }) it('should call the predicate with the input number', () => {. expect(mockPredicate).

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