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What tests to write for React
- The article discusses testing strategies for web applications, influenced by Igor Luchenkov's talk at React Advanced London and industry experts.
- The classic Test Pyramid model suggested unit tests at the bottom, integration tests in the middle, and end-to-end tests on top.
- Modern testing tools have evolved, challenging the assumptions of the Test Pyramid and leading to the development of the Testing Trophy.
- The Testing Trophy model places integration tests as a key component, along with static tests, unit tests, and end-to-end tests.
- Static tests check code without execution, while unit tests verify individual functions and integration tests check component interactions.
- End-to-end tests simulate real user behavior but are slower and complex to maintain compared to integration tests.
- Integration tests offer a balance of confidence and cost, capturing real issues users may encounter and mirroring software usage.
- The article provides examples of static tests, unit tests using Vitest, integration tests with React Testing Library, and end-to-end tests using Playwright.
- Recommended frameworks for each test type include TypeScript, ESLint, Vitest, Storybook, and Playwright, based on the testing needs.
- The mix of tests in your portfolio should consider factors like application complexity, team size, stability requirements, and development phase.
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