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test-driven-development

Write failing tests first to drive production code through Red-Green-Refactor.

Updated Apr 8, 2026
Search Tags:#testing#tdd#refactoring#red-green-refactor#unit-test#test-driven-development
One-click install
npx skills add https://github.com/SlevoDev/s-tag --skill test-driven-development-slevodev
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/SlevoDev/s-tag/tree/main/.claude/skills/test-driven-development
Command: npx skills add https://github.com/SlevoDev/s-tag --skill test-driven-development-slevodev

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Test-driven development (TDD) helps teams ensure software correctness by requiring a failing test before implementing production code, which reduces regressions and speeds up safe refactoring.

Core Features & Use Cases

  • Establishes a Red-Green-Refactor workflow that guides developers from failing tests to minimal production code and clean-up.
  • Encourages high-quality design by clarifying expected behavior through tests before coding, benefitting features, bug fixes, and refactors.
  • Supports learning and collaboration by making requirements explicit, catching edge cases early, and preventing accidental feature creep.

Quick Start

Write a failing test for the desired behavior, run it to see the failure, implement the minimal production code to pass, then refactor.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
What is the red-green-refactor cycle in test-driven development?▼

The red-green-refactor cycle in test-driven development requires writing a failing test first, implementing minimal production code to pass that test, and then refactoring the code for clarity and reliability.

How do I start writing unit tests using a test-first approach?▼

To start writing unit tests using a test-first approach, write a failing test for the desired behavior, run it to confirm the failure, implement the minimal code to pass, and finally refactor.

Can I apply test-driven development to bug fixes and refactoring?▼

Yes, you can apply test-driven development to bug fixes and refactoring across any language or stack by establishing a strict workflow where tests fail first to drive the necessary production code corrections.

Why does writing failing tests first improve software design?▼

Writing failing tests first improves software design by clarifying expected behavior before coding, which explicitly catches edge cases early, prevents accidental feature creep, and makes requirements explicit for collaboration.

Does test-driven development work with any programming language or stack?▼

Test-driven development works across any language or stack by enforcing a strict workflow where tests fail first, minimal implementation passes the tests, and subsequent refactoring ensures code correctness and reliability.

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