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test-driven-development

Enforce a red-green-refactor loop for test-driven development.

24|8|Updated Jan 14, 2026
Search Tags:#testing#refactoring#red-green-refactor#quality-assurance#software-engineering#test-driven-development
One-click install
npx skills add https://github.com/vadimcomanescu/codex-skills --skill test-driven-development-vadimcomanescu
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/vadimcomanescu/codex-skills/tree/main/skills/.curated/quality/test-driven-development
Command: npx skills add https://github.com/vadimcomanescu/codex-skills --skill test-driven-development-vadimcomanescu

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Test-driven development (TDD) helps teams define expected behavior via tests before coding, reducing bugs and enabling modular, maintainable design.

Core Features & Use Cases

  • Red-Green-Refactor loop: write a failing test, make the minimal change to pass, then refactor safely.
  • Behavior-driven design: guide API and UI decisions with tests to ensure reliability across refactors.
  • Use Case: when adding a new feature, start with a failing specification and iteratively implement until all tests pass.

Quick Start

Write a failing test, implement the minimal change to pass, then refactor while keeping tests green.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How does the red-green-refactor loop work in test-driven development?▼

The red-green-refactor loop in test-driven development works by writing a failing test first, making the minimal code change to pass it, and then refactoring safely while keeping tests green.

How do I start adding a new feature using test-driven development?▼

To start adding a new feature using test-driven development, write a failing specification that defines the expected behavior, then iteratively implement the code until all tests pass.

Can test-driven development guide API and UI design decisions?▼

Test-driven development can guide API and UI design decisions by defining expected behavior through tests before implementation, ensuring reliability across subsequent refactoring.

Does test-driven development apply to both unit and integration testing scenarios?▼

Test-driven development applies to unit, integration, and refactor scenarios where software behavior is defined by tests before implementation to prevent regressions.

What's the best way to prevent regressions when refactoring existing code?▼

The best way to prevent regressions when refactoring is to maintain green tests across revisions by applying the test-driven development loop, ensuring minimal-change implementation and safe refactoring.

Why write tests before implementation in software engineering?▼

Writing tests before implementation in software engineering helps define expected behavior upfront, reducing bugs and enabling modular, maintainable design throughout the development lifecycle.

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