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React Testing Patterns

Guides the agent to write behavior-focused React component, hook, and network-mocked tests

Source Download skill
Repository
affaan-m/ECC
Stars
295,127
Licence
MIT
Files
1 file

What it does

When installed, the agent follows a set of React testing conventions whenever you ask it to write or fix tests for components, hooks, or pages. It favors testing what a user sees and does, uses React Testing Library queries and userEvent interactions, mocks network requests with MSW, and includes accessibility checks with axe. It also helps decide whether a test belongs in a unit-style component test or in a Playwright or Cypress end-to-end run.

Great for

  • Frontend developers writing or repairing tests for React components and hooks
  • Teams migrating from Enzyme or class-component-era tests to React Testing Library
  • Developers setting up Vitest or Jest for a new React project

Skip it if

  • Non-React projects, since the patterns are specific to React and its testing libraries
  • Teams that need full end-to-end browser testing as their main focus, because this skill only covers the component-test side and the boundary guidance

Try asking

  • “Write React Testing Library tests for my LoginForm component, including validation errors”
  • “Fix this flaky test that uses setTimeout before asserting on the loaded list”
  • “Mock the /api/orders endpoint with MSW and test the error state on a 500 response”
  • “Add tests for my useCart custom hook using renderHook”
Step-by-step guide: how to use React Testing PatternsInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 1 original files, the MIT licence and an attribution note.

    react-testing.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip react-testing.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip react-testing.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Name the test runner and framework you use (Vitest, Jest, Next.js) so the agent picks the matching setup
  • Ask the agent to review generated tests against the query priority rules, since it will prefer role and label queries
  • Run the generated tests yourself, because the skill's guidance does not execute anything and results depend on your project setup

What's inside

  • SKILL.md

Redistributed unmodified from affaan-m/ECC under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.