Is this skill compatible with existing codebases?

Yes, it encourages adding tests for new changes and bug fixes even in legacy projects to systematically improve code quality and prevent regressions.

How does this skill handle the Red-Green-Refactor cycle?

It guides the developer through writing a minimal failing test (Red), implementing just enough code to pass (Green), and then cleaning up the code without changing behavior (Refactor).

Why is watching a test fail mandatory?

Watching a test fail proves that the test actually checks the intended logic and isn't passing by accident or due to existing behavior.

Can I skip TDD for simple fixes?

The skill emphasizes that even 'simple' code breaks; skipping TDD is seen as technical debt, though exceptions can be discussed with a human partner for throwaway prototypes.

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

The Iron Law mandates that no production code should be written without a failing test first; any code written beforehand must be deleted to ensure true test-first development.

Test-Driven Development (TDD)

Name: Test-Driven Development (TDD)
Author: ben-mad-jlp

byben-mad-jlp

0•

安全与测试

Enforces a strict Red-Green-Refactor workflow to ensure high-quality, bug-free production code through mandatory failing tests.

The Test-Driven Development (TDD) skill provides Claude with a rigorous framework for software development, prioritizing test creation before implementation. By following the 'Iron Law'—no production code without a failing test first—it ensures that every feature and bug fix is verified against actual requirements rather than assumptions. This skill guides Claude through the full TDD cycle, including failure verification, minimal code implementation, and safe refactoring, resulting in more maintainable, reliable, and well-documented codebases.

主要功能

01Promotes minimal code implementation to satisfy test requirements

02Ensures mandatory verification of failing tests to prevent false positives

03Enforces the Red-Green-Refactor cycle for all features and bug fixes

040 GitHub stars

05Eliminates technical debt by preventing unverified production code

06Provides systematic refactoring guidance while maintaining green test states

使用场景

01Implementing new features with clear behavioral specifications

02Fixing bugs by reproducing them with a failing test first

03Safe refactoring of legacy code by establishing a test baseline

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add ben-mad-jlp/claude-mermaid-collab test-driven-development

For use in Claude.ai and ChatGPT

Download Skill