React Testing Patterns
Master Testing Library and Vitest patterns for React components, custom hooks, and async workflows. This skill covers behavior-driven testing with userEvent, MSW for API mocking, renderHook for custom logic, and jest-axe for accessibility audits—everything except E2E tests and TDD enforcement.
React Testing Patterns teaches Testing Library and Vitest techniques for testing React components and hooks.
AI-generated summary based on this skill's SKILL.md
Decision gist · record as of 2026-02-06
React Testing Patterns teaches Testing Library and Vitest techniques for testing React components and hooks. Master Testing Library and Vitest patterns for React components, custom hooks, and async workflows. This skill covers behavior-driven testing with userEvent, MSW for API mocking, renderHook for custom logic, and jest-axe for accessibility audits—everything except E2E tests and TDD enforcement.
Use it when
- React Testing Patterns emphasizes querying by accessible roles and labels, avoiding implementation-detail selectors.
- React Testing Patterns covers renderHook for testing custom hooks in isolation, plus async patterns for handling side effects and API calls.
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hieutrtr/ai1-skills/react-testing-patterns · repository language: Python
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Frequently asked questions
AI-generated answers based on this skill's SKILL.md and metadata
How do I test React apps effectively?
React Testing Patterns teaches behavior-driven testing using Testing Library and Vitest. Focus on testing user interactions with userEvent rather than implementation details. Start by rendering components, simulating user actions, and asserting visible outcomes. The skill covers component testing, custom hook testing with renderHook, async logic handling, form validation, and state management patterns—all without E2E frameworks.
What are the best practices for testing React components?
React Testing Patterns emphasizes querying by accessible roles and labels, avoiding implementation-detail selectors. Write tests that mirror how users interact with your app. Use userEvent for realistic interactions, mock external APIs with MSW, and validate accessibility with jest-axe. Structure tests around user workflows rather than component internals to keep tests maintainable and resilient to refactors.
How can I test React hooks and async logic?
React Testing Patterns covers renderHook for testing custom hooks in isolation, plus async patterns for handling side effects and API calls. Use waitFor to handle asynchronous state updates, and MSW to mock network requests. The skill teaches how to test hooks that depend on context, manage cleanup, and verify async workflows without brittle timing assumptions.
What code examples does React Testing Patterns provide?
React Testing Patterns includes practical examples for component rendering, user interactions, form testing, state assertions, and custom hook logic. Examples demonstrate userEvent usage, MSW setup for API mocking, renderHook patterns, and jest-axe accessibility checks. Each pattern shows real-world scenarios like form submission, async data loading, and conditional rendering.
How do I improve test coverage and quality in React?
React Testing Patterns teaches strategies to write meaningful tests that catch real bugs. Focus on user-centric assertions rather than coverage percentages. Mock external dependencies with MSW, test accessibility with jest-axe, and validate both happy paths and error states. Structure tests around features and workflows to ensure quality over quantity.
What testing strategies work best for React forms and state?
React Testing Patterns covers form testing by simulating user input with userEvent, validating submission handlers, and checking error messages. For state, test how components respond to prop changes and user actions rather than inspecting internal state directly. Use waitFor for async validation, and organize tests around user workflows like filling forms and submitting data.
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