Can I use this with any programming language?

Yes, since the skill uses standard Bash and file editing tools, it can interface with any language's test runner (like Jest, Pytest, or JUnit).

Why is writing a failing test first important?

Writing a failing test first ensures that the test is actually checking the intended behavior and that the test suite is capable of catching failures.

What is the Red-Green-Refactor cycle in this skill?

It is a three-step process: first, write a failing test (Red); second, write the minimum code to pass the test (Green); and third, clean up the code (Refactor).

Does the skill perform refactoring automatically?

Claude will identify opportunities for refactoring after a test passes and perform them while ensuring the test suite remains green throughout the process.

How does this skill prevent over-engineering?

During the 'Green' phase, the skill instructs Claude to only write the minimal code necessary to make the test pass, resisting the urge to add untested functionality.

TDD: Red-Green-Refactor Workflow

Name: TDD: Red-Green-Refactor Workflow
Author: timgent

bytimgent

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セキュリティとテスト

Implements a strict Test-Driven Development cycle to ensure high-quality code through disciplined Red-Green-Refactor iterations.

The TDD skill enforces a professional engineering methodology by guiding Claude through the systematic Red-Green-Refactor lifecycle. It ensures that failing tests are authored before any implementation code, encourages the smallest possible changes to satisfy those tests, and mandates a dedicated refactoring phase to maintain code health. This skill is ideal for developers prioritizing software reliability and reduced technical debt, as it guarantees that every new feature or bug fix is fully verified by a reproducible automated test suite from the moment of conception.

主な機能

01Seamless integration with local test runners via Bash and file editing tools.

02Dedicated Refactor phase focused on code quality without functional changes.

03Strict Red phase enforcement requiring a failing test before any implementation.

043 GitHub stars

05Green phase optimization to write the minimal code necessary to pass tests.

06Continuous verification by running tests after every incremental modification.

ユースケース

01Refactoring legacy codebases safely by maintaining constant test validation.

02Building robust new software features with 100% initial test coverage.

03Resolving complex bugs by first creating a reproduction test case.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add timgent/claude-code-config tdd

For use in Claude.ai and ChatGPT