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$ curl repovive.com/roadmaps/javascript/testing-javascript/mock-return-values

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$ curl repovive.com/roadmaps/javascript/testing-javascript/mock-return-values

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Mock Return Values - Testing JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Mock Return Values

Control what mocks return

Configure mock functions to return specific values:

const mockFn = jest.fn();
mockFn.mockReturnValue(42);
console.log(mockFn()); // 42

mockFn.mockReturnValueOnce(1).mockReturnValueOnce(2);
console.log(mockFn()); // 1
console.log(mockFn()); // 2
console.log(mockFn()); // 42 (default)