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25 Jul 2025
Jest and ReactTestingLibrary are the gold standard for React application testing. Jest provides test runs, assertions, _mock_ and coverage reports. ReactTestingLibrary tests components by simulating user behavior and accessibility queries. If you use CreateReactApp, both are built in. Custom configurations require installing jest, @testing-library/react and setting jest.config.js and Babel configurations; unit tests use test() and expect() to verify function logic, such as formatPrice function formatting results; component test pass r

30 Jul 2025
First install and configure Vitest and ReactTestingLibrary, and then write tests centered on user behavior. 1. Installation dependencies: vitest, @testing-library/react, @testing-library/jest-dom, jsdom; 2. Configure the test environment to jsdom in vite.config.ts and set up setupFiles; 3. Create setupTest.ts to introduce jest-dom to extend expect; 4. Use render to render components, screen query elements, fireEvent to simulate interaction, and create vi.fn()

01 Aug 2025
Jest and ReactTestingLibrary are selected because they can simulate user behavior, reduce dependence on implementation details, and use out of the box; 1. Use render and screen.getByText to verify content when testing rendering; 2. Use fireEvent to simulate events and assert the results when testing interactions; 3. Use waitFor or findBy to wait for elements to be updated when testing asynchronous operations; 4. Use wrappers or pass props directly in when testing components with prop or context; priority should be given to accessibility queries, avoid excessive use of data-testid, test behavior rather than implementation, mock external dependencies, and overwrite load

29 Dec 2024
Why Choose Vitest? Vitest is designed with modern development in mind. Here’s why it stands out: Speed Vitest leverages Vite as its foundation, utilizing its lightning-fast hot module replacement (HMR) and esbuild for bundling and t

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Effective React component testing is crucial. React Testing Library (RTL) simplifies this process, emphasizing user interaction testing. This article presents five advanced RTL techniques for writing more efficient and maintainable unit tests. 1.

17 Nov 2024
Introduction This article is going to take you through how to use unit test and integration test to improve you development experience as you create rest apis in golang. Unit tests are designed to verify the functionality of the smallest, in


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