What is the 'Iron Law' of TDD Mastery?

The Iron Law dictates that no production code is written without a preceding failing test. If code is written first, it must be deleted and restarted from a test.

Does this skill support Python and JavaScript?

Yes, TDD Mastery includes specific workflows and tool detection for JavaScript/TypeScript (Vitest, Jest) and Python (Pytest).

How does it help with bug fixing?

It enforces a protocol where a failing test must be written to reproduce the bug before any fix is implemented, ensuring the fix is verified and documented.

What happens if a test passes immediately?

If a test passes immediately, it is considered invalid because it isn't testing new behavior. The skill requires you to fix the test or the environment until it fails correctly.

TDD Mastery

Name: TDD Mastery
Author: xenitV1

byxenitV1

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202

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セキュリティとテスト

Enforces a strict Test-Driven Development workflow by requiring verifiable failing tests before any production code is written.

TDD Mastery is a specialized skill for Claude Code designed to instill rigorous software engineering discipline through the 'Iron Law' of Test-Driven Development. It mandates the Red-Green-Refactor cycle, preventing the creation of unverified code by ensuring every feature or bug fix begins with a failing test. The skill provides specific implementation patterns for major frameworks like Vitest, Jest, and Pytest, while promoting the 'YAGNI' (You Aren't Gonna Need It) principle by restricting implementation to the minimal code required to pass tests. By integrating automated verification gates and contract-first testing, it transforms Claude into a disciplined pair programmer that prioritizes code reliability and long-term maintainability.

主な機能

01202 GitHub stars

02Mandatory verification of failing tests (Verify Red phase)

03Contract-first testing integration with Mock Service Worker (MSW)

04Strict Red-Green-Refactor cycle enforcement

05Automated 'Untested Logic Slab' detection for legacy code

06Support for Vitest, Jest, Pytest, and Playwright

ユースケース

01Decoupling frontend and backend development through contract-first API mocking

02Building high-reliability features where test coverage is non-negotiable

03Systematic bug fixing using reproduction tests to prevent regressions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add xenitv1/claude-code-maestro tdd-mastery

For use in Claude.ai and ChatGPT

Download Skill