What are the key React testing best practices?
Test behavior, not implementation. Prefer role and text queries. Use userEvent over fireEvent. Keep tests independent. Mock at the boundary. These keep tests valuable and surviving refactors.
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More FAQs in A Roadmap to Testing React Apps From Zero
In order: set up the test runner, write a first test, test interactions with userEvent, test async with findBy and waitFor, mock API calls, test edge cases, write integration tests, and learn best practices like testing behavior over implementation.
Set up the test runner, install Jest or Vitest and RTL, and run a sample test to confirm the setup works. Then write a first test that renders a simple component and asserts an element is present.
After you can test interactions. Async testing uses findBy queries and waitFor to test components that fetch data. Mock the API so your tests run fast and deterministically without a network.
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