To write comprehensive tests for React components, use Jest and React Testing Library. Install the tools via npm, then render your component with `render` from React Testing Library to query elements, and `fireEvent` to simulate user interactions. Writing unit tests helps ensure individual components work as expected, catches bugs early on, and prevents regressions when making code changes.
Snapshot testing detects unexpected changes in UI components by rendering and serializing output, then comparing it to expected output stored in a snapshot file, ensuring high-quality user interfaces and reducing debugging time.
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