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test-driven-development

Enforce test-first discipline through the Red-Green-Refactor cycle.

1|Updated Feb 3, 2026
Search Tags:#workflow#testing#tdd#red-green-refactor#unit-testing#software-engineering
One-click install
npx skills add https://github.com/trungtnm/claude-code-utils --skill test-driven-development-trungtnm
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/trungtnm/claude-code-utils/tree/main/plugins/skills/test-driven-development
Command: npx skills add https://github.com/trungtnm/claude-code-utils --skill test-driven-development-trungtnm

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Prevents production code from being written without validation by enforcing a test-first approach that catches design issues early.

Core Features & Use Cases

  • Enforces a strict Red-Green-Refactor cycle to guide developers from failing tests to passing implementations.
  • Helps teams avoid common TDD anti-patterns and ensures tests reflect real behavior rather than mocks.
  • Useful for feature work, bug fixes, and refactoring to maintain high confidence and prevent regressions.

Quick Start

Start by writing a failing test for the desired behavior, then implement the minimal code to pass, and iterate through red-green-refactor until all tests are green.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
What is the test-driven development process for writing reliable software?▼

Test-driven development enforces a strict Red-Green-Refactor cycle, requiring developers to write failing tests first, implement minimal code to pass them, and refactor only after achieving green tests to prevent unvalidated production code.

How do I start applying TDD to fix bugs and develop new features?▼

To apply TDD, write a real, minimal test that captures the desired behavior or bug condition, run it to confirm it fails, implement the production code to make it pass, and then refactor safely. This ensures tests reflect real behavior.

Can I use test-driven development for refactoring existing code safely?▼

Yes, test-driven development supports refactoring by ensuring existing tests remain green before and after code changes. This prevents regressions and maintains high confidence in software reliability throughout the refactoring process.

What are common TDD anti-patterns and how do I avoid them?▼

Common TDD anti-patterns include writing production code without tests and relying on mocks instead of real behavior. Avoid these by enforcing test-first discipline, writing minimal tests, and running them to fail before implementation.

Does test-driven development require any specific testing frameworks or dependencies?▼

No specific testing frameworks are required. The approach applies across software projects by enforcing test-first discipline and the Red-Green-Refactor cycle, making it compatible with any unit-testing framework you choose.

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