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test-driven-development

Enforce test-first implementation with failing tests before production code.

Updated Apr 2, 2026
Search Tags:#testing#tdd#software engineering#refactoring#bug fixing#red-green-refactor
One-click install
npx skills add https://github.com/JKhyro/HERMES-AGENT --skill test-driven-development-jkhyro
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/JKhyro/HERMES-AGENT/tree/main/skills/software-development/test-driven-development
Command: npx skills add https://github.com/JKhyro/HERMES-AGENT --skill test-driven-development-jkhyro

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill prevents implementation drift and hidden bugs by forcing you to define behavior with a failing test before writing production code. It helps you avoid brittle, unverified changes and keeps feature work, bug fixes, and refactors grounded in observable outcomes.

Core Features & Use Cases

  • Red-Green-Refactor Workflow: Guides you through writing a failing test, implementing the smallest passing change, and then cleaning up safely.
  • Behavior-Focused Validation: Encourages real-code tests that verify outcomes instead of internal implementation details.
  • Use Cases: Ideal for new features, bug fixes, behavior changes, and refactoring work where regression risk matters.

Quick Start

Use the test-driven-development skill to write one failing test for the behavior you want, verify it fails, implement the smallest change needed to pass, and then refactor without breaking the test.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How does test-driven development prevent hidden bugs in software engineering?▼

Test-driven development prevents hidden bugs by requiring a failing test that defines expected behavior before writing production code. This strict workflow ensures feature work, bug fixes, and refactors remain grounded in observable outcomes and regression protection.

How do I apply the red-green-refactor workflow to fix a bug?▼

To apply the red-green-refactor workflow for bug fixing, write a failing test reproducing the bug, verify it fails, implement the smallest production code change to pass it, and then refactor safely without breaking the test.

What is the best way to refactor code without introducing regressions?▼

The best way to refactor code without regressions is using test-driven development to enforce behavior verification. You make minimal passing changes and refactor safely under the protection of real-code tests with explicit failure verification.

When do I need test-first development for software delivery?▼

You need test-first development for software delivery when regression risk matters during new features, behavior changes, or refactoring work. It ensures disciplined iterative delivery by requiring behavior-focused validation and real-code tests before implementation.

Does this test-driven development approach require specific testing frameworks?▼

No specific testing frameworks are required. The test-driven development approach applies to any software development workflow needing behavior verification, relying on real-code tests that verify outcomes instead of internal implementation details across your chosen stack.

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