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test-driven-development

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

Updated Nov 14, 2025
Search Tags:#tdd#red-green-refactor#unit-testing#software-quality#test-driven-development#development-testing
One-click install
npx skills add https://github.com/Donaldshen27/xtrend-vanilla --skill test-driven-development-donaldshen27
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Donaldshen27/xtrend-vanilla/tree/main/.claude/skills/test-driven-development
Command: npx skills add https://github.com/Donaldshen27/xtrend-vanilla --skill test-driven-development-donaldshen27

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Write tests before code to prevent regressions and ensure correct behavior by forcing a failing test first.

Core Features & Use Cases

  • Test-first workflow: Start with a failing test, implement the minimal code to pass, and refactor for clarity.
  • Regression protection: Add tests for bug fixes and behavior changes to lock in intended outcomes.
  • Guided development: Use the TDD cycle to drive design decisions and document expected behavior.

Quick Start

Follow the Red-Green-Refactor cycle: write a failing test first, then implement the minimal code to pass.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How does test-driven development prevent software regressions?▼

Test-driven development improves design by using the test-first workflow to guide development decisions. Writing minimal tests forces you to define expected behavior clearly, resulting in cleaner, more modular code architecture.

What is the red-green-refactor cycle in unit testing?▼

The red-green-refactor cycle is a unit testing workflow where you first write a failing test, implement the minimal code required to make it pass, and then refactor the code for clarity. This enforces reliable behavior changes throughout development.

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

Yes, you can use test-driven development for bug fixes and refactoring across programming languages. Adding a failing test that reproduces the bug guards against regressions and validates the correct intended behavior before fixing the code.

Do I need a specific testing framework to start writing tests first?▼

No specific testing framework is required. Test-driven development integrates with standard test frameworks across various programming languages and ecosystems, allowing you to drive reliable code using your existing development testing tools.

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