test-driven-development

Guide software teams through the Red-Green-Refactor cycle for feature implementation and bug fixes.

Updated Mar 29, 2026
One-click install
npx skills add https://github.com/Me1e/ralphthon --skill test-driven-development-me1e
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Me1e/ralphthon/tree/main/.agents/skills/test-driven-development
Command: npx skills add https://github.com/Me1e/ralphthon --skill test-driven-development-me1e

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps teams adopt Test-Driven Development, ensuring tests guide feature work, prevent regressions, and improve code quality.

Core Features & Use Cases

  • Red-Green-Refactor: Follow the test-first cycle to write a failing test, implement minimal code, and refactor for clarity.
  • Guardrails for Changes: Applies to new features, bug fixes, and refactors to maintain behavior contracts.
  • Documentation through Tests: Produces living documentation of intended behavior via tests and clear expectations.

Quick Start

Write a failing test first, then implement the smallest amount of code necessary to pass it.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How does Test-Driven Development guide feature implementation?

Test-Driven Development guides feature implementation by enforcing a Red-Green-Refactor cycle: writing a failing test first, implementing minimal production code to pass it, and refactoring for clarity to prevent regressions and improve code quality.

How do I apply TDD when fixing bugs and refactoring code?

Apply TDD during bug fixes and refactoring by writing a failing test that reproduces the bug or verifies intended behavior contracts, then making minimal code changes to pass the test before refactoring.

What is the Red-Green-Refactor cycle in software development?

The Red-Green-Refactor cycle is a test-first software development process where you write a failing test (Red), implement the smallest amount of code necessary to pass it (Green), and then refactor the code for clarity.

Does test-driven development work for behavior changes in existing programming projects?

Yes, test-driven development works for behavior changes in existing programming projects by applying guardrails that maintain behavior contracts, ensuring new features and refactors do not introduce regressions.

Can writing tests first produce living documentation for my software?

Writing tests first produces living documentation of intended behavior by creating clear expectations within the tests, which continuously verify that your software development output matches the specified requirements.