test-driven-development

Guide code changes through the RED-GREEN-REFACTOR cycle with failing tests first.

7|1|Updated Feb 1, 2026

Search Tags:#testing #tdd #red-green-refactor #unit-testing #quality-assurance #development-process #test-driven-development

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npx skills add https://github.com/cloudfieldcz/cf-powers --skill test-driven-development-cloudfieldcz

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Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/cloudfieldcz/cf-powers/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/cloudfieldcz/cf-powers --skill test-driven-development-cloudfieldcz

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Test-driven development helps ensure code changes are guided by failing tests, improving reliability, documentation, and confidence in future changes.

Core Features & Use Cases

Red-Green-Refactor cycle: write a failing test, make it pass with minimal code, then refactor.
Test-first discipline: every feature, bug fix, or refactor starts with a test to specify behavior.
Guardrails for quality: promotes incremental changes, clearer intent, and regression protection across software projects.

Quick Start

Start with a failing test, then implement just enough code to pass, and finally refactor for clarity.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema

What is test-driven development and how does it improve code quality?▼

Test-driven development is a software workflow where you write a failing unit test before the production code. This test-first discipline improves reliability, creates living documentation, and ensures regression protection across software projects.

How do I practice the red-green-refactor cycle when writing unit tests?▼

To practice the red-green-refactor cycle, first write a failing test specifying the desired behavior. Next, implement minimal code to make it pass. Finally, refactor the code for clarity while keeping the unit tests green.

Can I use test-driven development for bug fixes and refactoring existing code?▼

Yes, test-driven development supports bug fixes and refactoring across software projects. You start by writing a failing unit test that captures the bug or specifies the new behavior, then implement minimal code to pass it.

What's the best way to write unit tests that clearly specify behavior?▼

The best way to write unit tests in a test-first workflow is to keep them minimal and well-named. Focus on incremental changes that express clear intent, ensuring each test specifies a single behavior before any production code is written.

When should I not use a test-first development approach?▼

You should avoid test-first development when rapid prototyping without defined behavior constraints, as the workflow requires specifying exact behavior through failing unit tests before writing any production code, which may slow initial exploratory coding.