testing-basics

To write unit tests for React components using Vitest, apply React Testing Library patterns to test component behavior and user events while focusing on accessibility rather than implementation details.

The best way to test API endpoints during MVP development is using a request library to validate route behavior, ensuring external services are properly mocked to guarantee reliable integration tests.

Yes, you can test utility functions with Vitest without external dependencies by writing tests that validate pure functions and utility modules to ensure they behave as expected.

Testing behavior instead of implementation improves code quality by ensuring tests validate user interactions and accessibility, making the test suite resilient to internal refactoring and external service changes.

Yes, you need to mock external services when using React Testing Library to isolate component testing, prevent flaky tests, and ensure your tests focus purely on component behavior and user events.

You need unit testing for MVP development when adding new features, ensuring all new components, API endpoints, and utility functions function correctly and meet the definition of done.