Why does this skill emphasize the Red phase so much?

Watching a test fail (Red) proves that the test is actually testing the intended behavior and that the failure message is clear, ensuring the test is valid before code is added.

How does this skill handle bug fixes?

It requires the creation of a failing test that reproduces the bug specifically. Only once the test fails for the correct reason can the minimal code fix be implemented.

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

The Iron Law mandates that no production code is written without a failing test first. If code is written before a test, it must be deleted and restarted from the test-first phase.

Can I skip TDD for simple configuration files or prototypes?

The skill allows exceptions for throwaway prototypes, generated code, and configuration files, but requires consultation with the human partner first.

Test-Driven Development Mastery

Name: Test-Driven Development Mastery
Author: ShunmeiCho

byShunmeiCho

0•

Security & Testing

Enforces a rigorous Red-Green-Refactor workflow to ensure high-quality, verified production code through strict TDD principles.

This skill transforms Claude into a disciplined TDD practitioner, enforcing the 'Iron Law' that no production code shall be written without a preceding failing test. It guides the development process through the essential Red-Green-Refactor cycle, focusing on behavior-driven assertions and minimal implementation code. By preventing technical debt and common rationalizations for skipping tests, this skill ensures that features and bug fixes are systematic, documented by tests, and highly maintainable.

Key Features

01Detection and prevention of common testing rationalizations

02Guidance on writing minimal, behavior-focused test cases

030 GitHub stars

04Strict Red-Green-Refactor cycle enforcement

05Iron Law compliance: No production code without a failing test first

06Systematic bug reproduction through failing test integration

Use Cases

01Implementing new features with a focus on desired behavior and interface design

02Safely refactoring existing codebases while maintaining a 'green' test state

03Fixing bugs by creating reproducible failing tests to prevent future regressions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add shunmeicho/claude-config test-driven-development

For use in Claude.ai and ChatGPT

Download Skill