Summary
This puts tests first in your development workflow, red-green-refactor style. Write a failing test, make it pass with minimal code, then clean up. The real win is the Prove-It Pattern for bugs: reproduce the issue with a test before you fix anything, so you know it's actually fixed and won't regress. The guide includes practical stuff like the test pyramid (80% unit, 15% integration, 5% E2E), testing state over interactions, and when to use real implementations versus mocks. If you're working with an AI agent on a codebase without tests, you're flying blind. This gives you the proof that changes actually work.
Install to Claude Code
npx -y skills add addyosmani/agent-skills --skill test-driven-development --agent claude-codeInstalls into .claude/skills of the current project.
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
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Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
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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 →Files
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Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% 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 →
