Summary
A strong foundation for testing React components the modern way: React Testing Library, Vitest or Jest, MSW for HTTP mocking, and axe for accessibility checks. The guide is opinionated in the right ways, prioritizing user-facing behavior over implementation details, accessible queries over test IDs, and userEvent over fireEvent. The MSW setup with onUnhandledRequest error is excellent for catching silent test passes. The custom hook testing section correctly warns about QueryClient instantiation gotchas. Light on the boundary between component tests and full E2E, but the query priority table and provider wrapping pattern alone will save you from common mistakes if you're migrating from Enzyme or setting up tests from scratch.
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Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →First SeenJul 14, 2026
