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test-driven-development

Enforce test-first development with the Red-Green-Refactor cycle.

Updated Dec 14, 2025
Search Tags:#code quality#unit tests#testing#TDD#refactoring#bug prevention#software development
One-click install
npx skills add https://github.com/pproenca/dot-claude --skill test-driven-development-pproenca
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/pproenca/dot-claude/tree/main/plugins/super/skills/test-driven-development
Command: npx skills add https://github.com/pproenca/dot-claude --skill test-driven-development-pproenca

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing code without tests often leads to bugs, regressions, and difficulty in refactoring, as you can't be sure if changes break existing functionality.

Core Features & Use Cases

  • Red-Green-Refactor Cycle: Guides you through writing failing tests, implementing minimal code to pass, and then refactoring for clean code.
  • Guaranteed Test Verification: Ensures tests actually verify behavior by requiring you to see them fail first, proving their validity.
  • Bug Prevention: Forces early detection of issues and prevents regressions by catching breaks immediately.
  • Use Case: When implementing any new feature or fixing a bug, this skill ensures you write a test that fails before writing any production code, proving your test is valid and preventing future regressions.

Quick Start

I need to implement a new user validation function. Use the test-driven-development skill to guide me through the process.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How do I write tests before implementing code?▼

Test-driven development requires writing a failing test first, then implementing minimal production code to pass it. This validates your test catches real failures and prevents regressions before code changes.

What is the Red-Green-Refactor cycle?▼

Red-Green-Refactor is a TDD pattern: write a failing test (Red), implement minimal code to pass it (Green), then refactor for clean code without breaking tests. It ensures code quality while maintaining correctness.

How does TDD prevent bugs and regressions?▼

Test-driven development catches issues early by requiring tests that fail before production code exists, proving test validity. Comprehensive test coverage detects breaks immediately when changes occur.

Can I use TDD for bug fixes and refactoring?▼

TDD applies to all code changes—new features, bug fixes, refactoring, and behavior changes. Write a failing test reproducing the bug or behavior first, then fix or refactor with test verification.

Why does my test need to fail first?▼

A failing test first proves your test actually validates behavior. If tests pass without production code, they don't verify anything, defeating the purpose of test-driven development.

What makes a good test name in TDD?▼

Disciplined test naming in TDD clearly describes what behavior is being verified, making test failures self-explanatory and tests readable as documentation of code behavior.

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