What is the 'Iron Law' in this TDD skill?

The Iron Law states that no production code should be written without a failing test first. If code is written before the test, it must be deleted and rewritten after the test is established.

Does TDD slow down development in Claude Code?

While it requires more steps upfront, TDD is faster overall because it prevents regressions, reduces time spent debugging in production, and automatically documents code behavior.

When should I skip TDD?

Exceptions include throwaway prototypes, purely generated code, or simple configuration files. For all other production logic, TDD is the required standard.

Why is the 'Verify RED' step mandatory?

Watching a test fail proves that the test is actually checking for the missing feature or bug. If a test passes immediately, it isn't testing the right thing or is testing existing behavior.

Can I use this skill for bug fixes?

Yes. The workflow for bugs is to write a failing test that reproduces the bug, verify the failure, and then write the fix to make the test pass.

Test-Driven Development (TDD)

Name: Test-Driven Development (TDD)
Author: ironbob

byironbob

0•

セキュリティとテスト

Enforces a strict Red-Green-Refactor workflow to ensure all production code is verified by failing automated tests before implementation.

This skill implements a rigorous Test-Driven Development (TDD) protocol for Claude Code, designed to eliminate technical debt and ensure high-quality software delivery. It mandates the 'Iron Law' of coding: no production code is written without a preceding failing test. By guiding users through the Red-Green-Refactor cycle—writing a test, watching it fail, implementing the minimal code to pass, and then cleaning up—this skill ensures that every line of code serves a verified purpose and that the test suite effectively guards against future regressions.

主な機能

01Safe refactoring workflows that maintain green status

02Strict Red-Green-Refactor cycle enforcement

03Bug reproduction through failing test cases

04Mandatory 'Verify RED' check to validate test accuracy

05Minimal implementation guidance to prevent over-engineering

060 GitHub stars

ユースケース

01Refactoring complex legacy logic while ensuring existing behavior persists

02Reproducing and fixing bugs by creating regression tests first

03Building new features with high reliability and documentation

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add ironbob/superpower_light test-driven-development

For use in Claude.ai and ChatGPT

主な機能

01Safe refactoring workflows that maintain green status

02Strict Red-Green-Refactor cycle enforcement

03Bug reproduction through failing test cases

04Mandatory 'Verify RED' check to validate test accuracy

05Minimal implementation guidance to prevent over-engineering

060 GitHub stars

ユースケース

01Refactoring complex legacy logic while ensuring existing behavior persists

02Reproducing and fixing bugs by creating regression tests first

03Building new features with high reliability and documentation

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add ironbob/superpower_light test-driven-development

For use in Claude.ai and ChatGPT