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Mock Functions - Testing JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Mock Functions

Create fake functions for testing

Mock functions track calls and control return values:

const mockFn = jest.fn();
mockFn('arg1', 'arg2');

expect(mockFn).toHaveBeenCalled();
expect(mockFn).toHaveBeenCalledWith('arg1', 'arg2');
expect(mockFn).toHaveBeenCalledTimes(1);

Mocks let you test code in isolation without real dependencies.