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test-driven-development

Write failing tests before production code using the Red-Green-Refactor cycle.

Updated Apr 3, 2026
Search Tags:#tdd#debugging#red-green-refactor#code-quality#test-driven-development#software-testing
One-click install
npx skills add https://github.com/handsomelong922/my-codex-skills --skill test-driven-development-handsomelong922
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/handsomelong922/my-codex-skills/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/handsomelong922/my-codex-skills --skill test-driven-development-handsomelong922

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Software development often yields bugs and regressions when code is written before tests. Test-driven development solves this by mandating tests that define expected behavior before implementation.

Core Features & Use Cases

  • Red-Green-Refactor cycle guides design and ensures test coverage.
  • Early failure detection provides fast feedback and safer refactoring.
  • Use Case: during feature addition, bug fixes, or performance improvements to lock in correct behavior with tests.

Quick Start

Start by writing a failing test that captures the desired behavior, then implement the minimal code to make the test pass.

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 prevent code regressions?▼

Test-driven development is a test-first discipline that prevents bugs and regressions by mandating tests defining expected behavior before writing production code, ensuring correctness across feature development and refactoring.

How do I start applying the Red-Green-Refactor cycle for software testing?▼

Start applying the Red-Green-Refactor cycle by writing a failing test that captures the desired behavior, then implement the minimal code to make the test pass, and finally refactor safely while maintaining test coverage.

When should I use a test-first approach for bug fixes and feature additions?▼

Use a test-first approach during feature addition, bug fixes, or performance improvements to lock in correct behavior with tests, providing fast feedback and preventing future regressions in your software project.

What's the best way to ensure code quality when adding new features to an existing codebase?▼

The best way to ensure code quality is applying test-driven development, using the Red-Green-Refactor cycle to guide design and enforce minimal implementation that satisfies tests, protecting against regressions.

Why does writing tests after implementation lead to software regressions?▼

Writing tests after implementation leads to regressions because tests often merely validate existing code flaws rather than defining expected behavior, whereas test-driven development forces minimal implementation to satisfy predefined tests.

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