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Mocking Modules - Testing JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

Open in Course

Mocking Modules

Replace entire modules

Mock entire modules to control their behavior:

jest.mock('./api');
import { fetchUser } from './api';

fetchUser.mockResolvedValue({ name: 'Test User' });

test('uses mocked API', async () => {
  const user = await fetchUser(1);
  expect(user.name).toBe('Test User');
});

The real module never runs. Your test controls all responses.