Why is it mandatory to watch the test fail (RED phase)?

Watching a test fail confirms that the test is actually testing the right thing and that it fails for the expected reason rather than a configuration error or accidental success.

What are the exceptions to using the TDD skill?

Common exceptions include throwaway prototypes, generated code, and configuration files, though it's advised to consult with your human partner before skipping the protocol.

Can I use this skill for bug fixes?

Yes, it is highly recommended. You must first write a failing test that reproduces the bug, then write the minimal code to pass it, ensuring the bug is fixed and won't regress.

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

The Iron Law dictates that no production code should be written without a failing test first. If code is written before a test, it must be deleted and implemented fresh from tests.

How does this help with code design?

By writing tests first, you focus on the desired API and behavior (what the code should do) rather than the implementation (how it does it), leading to more decoupled and usable code.

Test-Driven Development (TDD)

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

byjanuarfonti

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보안 및 테스팅

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

This skill implements a rigorous Test-Driven Development (TDD) protocol for Claude Code, mandating that no production code is written without a preceding failing test. By guiding users through the systematic Red-Green-Refactor cycle, it ensures that every feature and bug fix is verified against expected behavior, leading to better software design, reduced technical debt, and comprehensive test coverage. It is particularly useful for building robust systems where reliability and maintainability are paramount, providing a systematic approach to software quality that prevents regressions and documents behavior through code.

주요 기능

01Strict enforcement of the 'Red-Green-Refactor' development cycle

02Mandatory verification of failing tests to prove test validity

03Minimalist coding principles to prevent over-engineering (YAGNI)

04Comprehensive verification checklists for feature completion

05Systematic bug fixing through reproduction test cases

060 GitHub stars

사용 사례

01Safe refactoring of complex codebases by maintaining continuous green states

02Implementing new features with guaranteed test coverage and documentation

03Fixing software bugs by first creating a reproducible failing test

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add januarfonti/opencode-template-configured test-driven-development

For use in Claude.ai and ChatGPT

Download Skill