test-driven-development

Enforce red-green-refactor cycles by writing failing tests before code.

Updated Mar 17, 2026

Search Tags:#tdd #qa #red-green-refactor #code-quality #unit-testing #software-engineering #test-driven-development

Ready to run

npx skills add https://github.com/Avi977/ace-claude-toolkit --skill test-driven-development-avi977

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Avi977/ace-claude-toolkit/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/Avi977/ace-claude-toolkit --skill test-driven-development-avi977

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Test-Driven Development (TDD) enforces writing tests before production code to reduce defects, clarify requirements, and guide incremental design throughout the development lifecycle.

Core Features & Use Cases

Red-Green-Refactor cycle: Write a failing test, implement just enough code to pass, and refactor safely.
Guardrails for feature work: Provides a repeatable workflow that applies to new features, bug fixes, and refactors to ensure behavior is validated via tests.
Quality emphasis: Encourages maintainable, well-factored code with automatic regression checks.

Quick Start

Write a failing test first, implement the minimal code to pass, and refactor for clarity.

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 unit tests before code using test-driven development?▼

Test-driven development begins by writing a failing unit test that defines desired behavior, implementing minimal production code to pass it, and refactoring safely while maintaining a green test suite.

What is the red-green-refactor cycle in TDD?▼

The red-green-refactor cycle is a test-driven development loop where you write a failing test, write just enough code to make it pass, and then refactor the implementation for clarity without breaking behavior.

Can I apply test-driven development to bug fixes and refactoring?▼

Yes, test-driven development applies to bug fixes and refactoring by first writing a test that reproduces the bug or validates existing behavior, ensuring all changes are guarded by automated regression checks.

Does test-driven development work with multiple programming languages?▼

Test-driven development spans multiple programming languages and requires a minimal test suite discipline with a repeatable process to run tests, ensuring language-agnostic validation of feature additions and refactors.

Why should I write failing tests before implementing production code?▼

Writing failing tests before production code clarifies requirements, reduces defects, and guides incremental design by providing clear failure feedback that validates expected behavior throughout the lifecycle.

When should I not use test-driven development for software engineering tasks?▼

Test-driven development may not suit exploratory spikes or throwaway prototypes where immediate behavior validation is unnecessary, as it requires maintaining a repeatable test process and minimal test suite discipline.