How does the Red-Green-Refactor cycle work?

It follows three steps: RED (write a failing test), GREEN (write minimal code to pass), and REFACTOR (clean up the code while keeping the test green).

Does this skill support bug fixing?

Yes. It follows a process where you must write a failing test that reproduces the bug before any fix is implemented, ensuring the bug is gone and won't return.

Why can't I write tests after the code is done?

Tests written after code often pass immediately, which doesn't prove they are testing the right behavior. TDD ensures the test is capable of catching a failure before you rely on it.

What is the Iron Law in this TDD skill?

The Iron Law dictates that no production code is written without a failing test first. If code is written before a test, it must be deleted and restarted to ensure the test truly validates the implementation.

Test-Driven Development (TDD)

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

byPeterFile

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安全与测试

Enforces a strict Red-Green-Refactor workflow to ensure high-quality, bug-free production code through test-first implementation.

This skill transforms Claude into a disciplined TDD practitioner, mandating a rigorous cycle of writing failing tests before any production code is authored. It prevents technical debt and over-engineering by focusing on minimal, behavior-driven implementations rather than speculative features. By strictly adhering to the 'Iron Law' of TDD—deleting any production code written without a prior failing test—it ensures that every line of code is verified, documented, and protected against future regressions, making it an essential tool for building robust features, fixing complex bugs, and performing safe refactoring.

主要功能

01Comprehensive verification checklists for bug fixes and new features

02YAGNI-compliant minimal code implementation to pass tests

03Automated Red-Green-Refactor cycle management

0425 GitHub stars

05Strict enforcement of the 'No failing test, no production code' Iron Law

06Verification of failure messages to ensure tests are valid (Verify RED)

使用场景

01Fixing bugs by first creating a reproducing failing test case

02Safely refactoring legacy code by establishing test guards before modification

03Building new features with 100% verified behavior-driven coverage

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add peterfile/devpilot-agents test-driven-development

For use in Claude.ai and ChatGPT

Download Skill