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test-driven-development

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

1|Updated May 6, 2026
Search Tags:#tdd#red-green-refactor#quality-assurance#unit-tests#development-process#test-driven-development#software-testing
One-click install
npx skills add https://github.com/yckkkk/reo --skill test-driven-development-yckkkk
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/yckkkk/reo/tree/main/.agents/skills/test-driven-development
Command: npx skills add https://github.com/yckkkk/reo --skill test-driven-development-yckkkk

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing code without tests leads to undetected regressions and unclear behavior. This skill promotes a test-first approach to ensure changes are driven by failing tests and validated by reliable outcomes.

Core Features & Use Cases

  • Enforces Red-Green-Refactor workflow to ensure tests guide implementation.
  • Applies to new features, bug fixes, and refactors to prevent regressions.
  • Improves confidence and maintainability by validating test-driven discipline across codebases.

Quick Start

Create a failing test for the intended feature, then write the minimal production code to satisfy the test.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How do I start test-driven development for a new feature?▼

To start test-driven development, create a failing test for the intended feature, then write the minimal production code required to satisfy that test before refactoring safely.

What is the Red-Green-Refactor cycle in unit testing?▼

The Red-Green-Refactor cycle is a test-driven development workflow where you write a failing test (red), implement minimal code to pass it (green), and then safely improve the code (refactor).

Does test-first development work for bug fixes and refactoring?▼

Yes, test-first development applies to bug fixes and refactoring by ensuring explicit failing tests precede code changes, preventing regressions across typical software projects.

Why does writing code without tests cause regressions?▼

Writing code without tests causes undetected regressions and unclear behavior because changes lack validation, whereas a test-first approach ensures changes are driven by failing tests and validated by reliable outcomes.

What's the best way to enforce disciplined unit testing practices?▼

The best way to enforce disciplined unit testing practices is to adopt a test-first development skill that mandates a failing test precedes production code across features, bug fixes, and refactors.

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