When should I learn async testing in React?
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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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 individual components and async. Integration tests test multiple components working together, like a form updating a list or adding to a cart updating the cart.
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