tdd

Guide software development through the RED-GREEN-REFACTOR cycle with test case generation.

Updated Jan 25, 2026

Search Tags:#code quality #testing #tdd #refactoring #unit testing #development methodology

Ready to run

npx skills add https://github.com/Ho-Gyu-Lee/hello-claude-code --skill tdd-ho-gyu-lee

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: tdd
Source: https://github.com/Ho-Gyu-Lee/hello-claude-code/tree/main/skills/tdd
Command: npx skills add https://github.com/Ho-Gyu-Lee/hello-claude-code --skill tdd-ho-gyu-lee

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write more robust, maintainable, and bug-free code by enforcing the Test-Driven Development (TDD) methodology, ensuring that code is always accompanied by tests.

Core Features & Use Cases

Guided TDD Cycle: Guides users through the RED-GREEN-REFACTOR cycle.
Test Case Generation: Assists in defining relevant test cases for given functionalities.
Use Case: When developing a new user authentication module, use this Skill to first write tests for login, logout, and password reset, then implement the code to pass those tests, and finally refactor for clarity and efficiency.

Quick Start

Use the tdd skill to develop a function that validates user email addresses.

Frequently Asked Questions about tdd

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

FAQPage Schema

How do I apply Test-Driven Development to write better code?▼

Test-Driven Development improves code quality by guiding you through the RED-GREEN-REFACTOR cycle. You write failing tests first, implement minimal code to pass them, and then refactor for clarity and maintainability.

What is the RED-GREEN-REFACTOR cycle in unit testing?▼

The RED-GREEN-REFACTOR cycle is a unit testing methodology where you first write a failing test (RED), implement minimal code to make it pass (GREEN), and then refactor the code for improved quality without changing behavior.

How do I define test cases for a new software module?▼

You define test cases for a new software module by first identifying its required functionalities and interfaces. This Skill assists in deriving relevant test cases from those functionalities before any implementation code is written.

Can I use Test-Driven Development for any programming language?▼

Yes, Test-Driven Development is applicable to all programming tasks requiring robust and well-tested code. The methodology supports defining interfaces, writing failing tests, and refactoring regardless of the specific language used.

When should I use Test-Driven Development in my development workflow?▼

You should use Test-Driven Development when you need to ensure code is robust, maintainable, and bug-free. It is particularly effective when developing new modules, like a user authentication system, to enforce that code is always accompanied by tests.

What is the best way to refactor code after writing unit tests?▼

The best way to refactor code after unit testing is to follow the REFACTOR phase of the TDD cycle. Once tests pass, you improve code clarity and efficiency while ensuring the existing tests continue to validate functionality.