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test-driven-development

Enforce test-first development with red-green-refactor cycles.

Updated Jun 1, 2026
Search Tags:#testing#tdd#refactoring#red-green-refactor#software-quality#tests-first
One-click install
npx skills add https://github.com/SatangThevalue/ai-skills --skill test-driven-development-satangthevalue
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/SatangThevalue/ai-skills/tree/main/skills/software-development/test-driven-development
Command: npx skills add https://github.com/SatangThevalue/ai-skills --skill test-driven-development-satangthevalue

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

TDD prevents late bug discovery by enforcing a test-first approach that drives design and quality through red-green-refactor cycles.

Core Features & Use Cases

  • Test-First Principle: Write failing tests before production code to define expected behavior.
  • Cycle Discipline: Follow RED — write a failing test, GREEN — implement minimal code to pass, REFACTOR — clean up while keeping tests green.
  • Reliable Refactoring: Safely evolve code by validating behavior with automated tests during refactors.
  • Use Case: On a bug fix or feature addition, start with a failing test, implement the simplest code to pass, and refactor with confidence, ensuring regression protection.

Quick Start

Write a failing test for a small feature, 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 the red-green-refactor cycle work?▼

Test-driven development enforces a test-first approach where you write a failing test, implement minimal code to pass it, then refactor while keeping tests green. This cycle drives design and prevents late bug discovery.

How do I start writing tests before code for a new feature or bug fix?▼

Start test-first development by writing a failing test that defines expected behavior for the feature or bug fix. Run it to confirm failure, implement the simplest code to pass, then refactor safely with regression protection.

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

Yes, test-first development clarifies scope for bug fixes and refactors across projects. You write a failing test reproducing the bug, implement the fix to pass, then refactor with confidence knowing automated tests validate behavior.

Why does writing tests before production code improve software quality?▼

Writing tests before production code improves software quality by defining expected behavior upfront and enforcing cycle discipline. This prevents late bug discovery and ensures reliable refactoring through continuous automated validation.

What's the best way to ensure safe code refactoring without breaking existing behavior?▼

The best way to ensure safe refactoring is maintaining green tests throughout the process. Validate behavior with automated tests during refactors, cleaning up code while continuously confirming that existing tests remain passing.

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