Jest
Test Basics & Matchers
Test Basics & Matchers Structure // Organizing tests describe('UserService', () => { describe('create', () => { it('should create a user with valid data', () =>…
Test Basics & Matchers Structure // Organizing tests describe('UserService', () => { describe('create', () => { it('should create a user with valid data', () =>…
Mocking & Advanced jest.fn() — Mock Functions const mockFn = jest.fn(); // Set return value mockFn.mockReturnValue(42); mockFn.mockReturnValueOnce(10).mockRetur…
Jest Interview Questions Q: What is the difference between unit, integration, and e2e tests? Unit — test a single function/class in isolation; all dependencies …
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