tdd

Guide developers through the RED-GREEN-REFACTOR cycle for test-first development.

1|Updated May 21, 2026
One-click install
npx skills add https://github.com/youhei-ushio/dotclaude-public --skill tdd-youhei-ushio
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: tdd
Source: https://github.com/youhei-ushio/dotclaude-public/tree/main/skills/global/tdd
Command: npx skills add https://github.com/youhei-ushio/dotclaude-public --skill tdd-youhei-ushio

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps developers to adopt test-first development practices, ensuring the creation of robust and bug-free code by emphasizing thorough testing upfront.

Core Features & Use Cases

  • Test-First Approach: Guides developers to write failing tests before implementation.
  • RED-GREEN-REFACTOR Cycle: Encourages a structured approach of failing test (RED), passing test (GREEN), and refactoring.
  • Documentation and Best Practices: Provides guidelines on implementing and maintaining test-first development.

Quick Start

Start a new test-driven development cycle for a feature by creating a failing test in the 'tests' directory.

Frequently Asked Questions about tdd

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
What is test-first development and how does it improve code quality?

Test-first development is a methodology where you write failing tests before implementation to build reliable software. It improves code quality by enforcing structured RED-GREEN-REFACTOR cycles and comprehensive testing upfront.

How do I start a test-driven development cycle for a new feature?

To start test-driven development, create a failing test in the tests directory before writing any implementation code. This initiates the RED phase, guiding you to pass the test (GREEN) and then refactor.

How does the RED-GREEN-REFACTOR cycle work in software testing?

The RED-GREEN-REFACTOR cycle works by first writing a failing test (RED), implementing code to pass the test (GREEN), and then refactoring the code while keeping tests green. This structured approach ensures reliability.

When do I need to adopt a test-first development methodology?

You need to adopt a test-first development methodology when building robust and bug-free software is a priority. It ensures thorough testing upfront, preventing defects and enhancing overall code reliability before deployment.

Are there specific frameworks required to implement test-first practices?

No specific testing frameworks are required to implement test-first practices. The methodology provides guidelines and examples for writing tests before coding, adaptable to your preferred testing tools and development environment.