test-driven-development

Enforce the Red-Green-Refactor cycle with failing tests before production code.

7|Updated Mar 15, 2026
One-click install
npx skills add https://github.com/Cobalt-Money/Cobalt --skill test-driven-development-cobalt-money
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Cobalt-Money/Cobalt/tree/main/.agents/skills/test-driven-development
Command: npx skills add https://github.com/Cobalt-Money/Cobalt --skill test-driven-development-cobalt-money

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This skill prevents the accumulation of technical debt and ensures high code quality by enforcing the Red-Green-Refactor cycle, eliminating the common pitfalls of writing tests after implementation or skipping them entirely.

Core Features & Use Cases

  • Strict TDD Enforcement: Mandates failing tests before any production code is written to ensure tests are meaningful.
  • Anti-Pattern Prevention: Provides guidance on avoiding common testing mistakes like mocking behavior instead of real logic or polluting production code with test-only methods.
  • Use Case: When implementing a new feature or fixing a bug, use this skill to guide the process of writing a failing test first, ensuring the implementation is minimal and the behavior is verified.

Quick Start

Use the test-driven-development skill to guide me through the Red-Green-Refactor cycle for the new user authentication feature.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How do I enforce strict test-driven development cycles for reliable code?▼

To enforce strict test-driven development, mandate the Red-Green-Refactor cycle by writing a failing test before any production code. This ensures tests are meaningful and prevents skipping tests entirely.

What are common testing anti-patterns to avoid during refactoring?▼

Common testing anti-patterns to avoid during refactoring include mocking behavior instead of testing real logic and polluting production code with test-only methods. Preventing these mistakes maintains code integrity.

How do I fix a bug using the Red-Green-Refactor cycle?▼

Fix a bug using the Red-Green-Refactor cycle by first writing a failing test that reproduces the bug. Then, implement minimal production code to pass the test, ensuring the behavior is verified.

Does test-driven development prevent technical debt when implementing new features?▼

Yes, test-driven development prevents the accumulation of technical debt by eliminating the pitfall of writing tests after implementation. It ensures high code quality through strict cycle enforcement.

Can I use this workflow for both feature implementation and bug fixes?▼

Yes, you can use this workflow for both feature implementation and bug fixes. It applies across software development lifecycles to ensure all production code is verified by a preceding failing test.

Why write a failing test before writing production code?▼

Writing a failing test before production code ensures the test is actually verifying the target behavior. This strict test-driven development enforcement guarantees minimal implementation and high quality assurance.