test-driven-development

Guide the Red-Green-Refactor cycle for writing failing tests before implementation code.

1|Updated Feb 6, 2026

Search Tags:#code quality #testing #tdd #refactoring #software development #agile

Ready to run

npx skills add https://github.com/Adam-Guerin/Asmblr --skill test-driven-development-adam-guerin

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Adam-Guerin/Asmblr/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/Adam-Guerin/Asmblr --skill test-driven-development-adam-guerin

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write higher-quality, more reliable code by enforcing the Test-Driven Development (TDD) methodology, ensuring that tests are written before implementation code.

Core Features & Use Cases

Enforces TDD: Guides users through the Red-Green-Refactor cycle.
Prevents Regressions: Ensures new code doesn't break existing functionality.
Improves Design: Writing tests first often leads to more modular and testable code.
Use Case: When starting a new feature, use this Skill to write a failing test first, then write the minimal code to pass, and finally refactor.

Quick Start

Follow the Red-Green-Refactor cycle for all new code.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema

How do I start writing code using test-driven development?▼

Test-driven development starts by writing a failing test before any implementation code. You then write the minimal code required to pass that test, and finally refactor the implementation while ensuring the test still passes.

What is the Red-Green-Refactor cycle in TDD?▼

The Red-Green-Refactor cycle is the core TDD process where you write a failing test, write minimal code to make it pass, and then refactor the code. This cycle ensures software remains modular and prevents regressions.

Why does writing tests before implementation improve software design?▼

Writing tests before implementation improves software design because it forces you to consider usability and modularity upfront. This approach naturally leads to more testable, decoupled code structures.

When do I need to use test-driven development for agile projects?▼

You need test-driven development for agile projects when starting any new feature to prevent regressions. It enforces writing failing tests first, ensuring new code does not break existing functionality.

What are common TDD anti-patterns and rationalizations to avoid?▼

Common TDD anti-patterns include skipping the failing test phase or writing excessive code beyond what is needed to pass. Avoid rationalizations that bypass the Red-Green-Refactor cycle to ensure reliable software.

Does test-driven development require specific testing frameworks to work?▼

Test-driven development does not require specific frameworks, as the methodology focuses on the Red-Green-Refactor process rather than tools. You apply the cycle using whatever testing libraries your software stack supports.