guicedee/test-driven-development
skills/.curated/test-driven-development/SKILL.md
Test-driven development workflow (red → green → refactor) for features, bug fixes, and refactors. Use when implementing behavior changes and you want to drive design via tests, prevent regressions, and keep code modular and well-factored.
$ install --global
skillsauthnpx skillsauth add guicedee/ai-rules test-driven-developmentInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- test-driven-development
- description:
- Test-driven development workflow (red → green → refactor) for features, bug fixes, and refactors. Use when implementing behavior changes and you want to drive design via tests, prevent regressions, and keep code modular and well-factored.
Test-Driven Development
Write the test first, then write the smallest change that makes it pass, then refactor safely.
Core loop
- Red: write a failing test that expresses the desired behavior.
- Green: implement the minimum change to pass.
- Refactor: improve structure while keeping tests green.
Quick Start
- Start from the public interface (API, function, UI behavior), not private helpers.
- Prefer “behavioral” test names (what), not “implementation” names (how).
- When fixing bugs: reproduce with a test first.
Guardrails
- Don’t over-mock: prefer integration at boundaries; mock only slow/flaky externals.
- Keep tests deterministic: control time, randomness, and network.
- If a test is hard to write, your design likely needs an interface seam.
Red/Green/Refactor checklist
- Red: test fails for the right reason (not setup errors).
- Green: smallest change to pass, no extra behavior.
- Refactor: improve structure without changing behavior or tests.
References
- Common anti-patterns:
references/testing-anti-patterns.md
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