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Jest Cheat Sheet
Print-ready cheat sheet for Jest, organized for fast lookup, study, and desk-side use
Sample
What's in this cheat sheet
Installation
npm install --save-dev jest
# package.json: "scripts": { "test": "jest" }
npx jest # run all tests
npx jest --watch # re-run on changes
File Naming
*.test.js | Test files (default pattern) |
*.spec.js | Alternative test pattern |
__tests__/ | Test directory (auto-discovered) |
Running Specific Tests
npx jest path/to/file.test.js
npx jest --testNamePattern="adds"
npx jest --verbose # detailed output
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