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test-driven-development

Enforce Test-Driven Development by writing failing tests before implementation code.

Updated Mar 7, 2026
Search Tags:#code quality#testing#tdd#development#refactoring#agile
One-click install
npx skills add https://github.com/Geargrindadmin/gg-agentic-harness --skill test-driven-development-geargrindadmin
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Geargrindadmin/gg-agentic-harness/tree/main/.agent/skills/test-driven-development
Command: npx skills add https://github.com/Geargrindadmin/gg-agentic-harness --skill test-driven-development-geargrindadmin

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill enforces a rigorous development process by ensuring that tests are written before any implementation code, preventing bugs and ensuring code reliability.

Core Features & Use Cases

  • Test-First Development: Mandates writing failing tests before writing production code.
  • Red-Green-Refactor Cycle: Guides users through the iterative process of writing tests, implementing minimal code to pass, and then refactoring.
  • Use Case: When starting a new feature, use this Skill to guide you in writing the test that defines the expected behavior, ensuring the feature meets requirements from the outset.

Quick Start

Follow the test-driven development process by writing a failing test for the new functionality.

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?▼

Test-first development requires writing failing tests before any production code to prevent bugs and ensure reliability. It defines expected behavior upfront, ensuring new features meet requirements from the outset.

How do I start writing code using the TDD methodology?▼

To start TDD, write a failing test for the new functionality before writing any implementation code. Then, create the minimal code required to pass the test, and finally refactor the code while keeping tests green.

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

Yes, test-driven development supports refactoring by guiding you through the Red-Green-Refactor cycle. You write tests to verify existing behavior, ensure they pass, and then safely refactor the implementation to improve code quality.

Why should I write tests before implementation code?▼

Writing tests before implementation code prevents bugs and ensures code reliability by establishing a strict development discipline. It enforces a rigorous process where functionality is defined and verified from the very start.

Does test-driven development work for agile development workflows?▼

Test-driven development fits agile workflows by enforcing iterative Red-Green-Refactor cycles that align with incremental feature delivery. It ensures robust, verifiable code quality through continuous testing and refactoring.

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