react-testing

To test React components user-centrically, use React Testing Library to render elements, query the DOM like a user, and simulate events with userEvent, ensuring tests validate accessible markup and actual behavior rather than internal implementation details.

Mock network requests in Vitest by integrating Mock Service Worker (MSW) to intercept API calls, allowing you to isolate React component tests and simulate server responses for fast, reliable asynchronous behavior validation.

Yes, you can test React 19 features and custom hooks using Vitest, which provides robust assertion capabilities to validate new React 19 patterns and asynchronous behavior in your components.

The best way to validate accessibility in React tests is using React Testing Library to query elements by accessible roles and labels, verifying keyboard navigation and accessible markup during simulated user interactions.

Write a basic React component test by importing render and screen, rendering your component into the DOM, and using screen to query elements by role, then simulating user input with userEvent to verify expected outputs.