test-driven-development

Write tests before code using the RED-GREEN-REFACTOR cycle with Python.

Updated May 25, 2026

Search Tags:#code quality #testing #bug prevention #red-green-refactor #test-driven-development

Ready to run

npx skills add https://github.com/zaiyemeiyou404/Hermes --skill test-driven-development-zaiyemeiyou404

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/zaiyemeiyou404/Hermes/tree/main/backup/skills/software-development/test-driven-development
Command: npx skills add https://github.com/zaiyemeiyou404/Hermes --skill test-driven-development-zaiyemeiyou404

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires unittest, pytest, and includes scripts (resource) and references (resource) components.

What problem does it solve?

The TDD skill helps in maintaining high code quality and reliability by following a strict test-first approach.

Core Features & Use Cases

Test-First Development: Promotes writing tests before coding to ensure requirements are met.
RED-GREEN-REFACTOR Cycle: A structured approach for testing, coding, and refactoring code to improve quality.
Bug Prevention: Encourages thinking about potential failures and edge cases upfront, reducing the number of bugs in the code.
Use Case: When developing new features or fixing bugs, use this skill to write tests upfront, ensuring that every function is thoroughly tested.

Quick Start

Write a test to validate the behavior of your function before coding the actual function implementation.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema

How do I use test-driven development to prevent bugs in new features?▼

Test-driven development prevents bugs by enforcing a test-first approach where you write tests validating expected behavior before implementing production code. This upfront requirement validation reduces edge case failures.

What is the RED-GREEN-REFACTOR cycle in test-driven development?▼

The RED-GREEN-REFACTOR cycle is a structured test-driven development approach. You write a failing test (RED), implement code to pass it (GREEN), and refactor the code to improve quality while maintaining passing tests.

Can I use pytest and unittest for test-driven development in Python?▼

Yes, you can use pytest and unittest for test-driven development in Python. Both libraries provide the necessary test creation and execution capabilities required to validate behavior before coding actual function implementations.

What's the best way to start writing tests before coding a function?▼

The best way to start writing tests before coding is to write a test validating the specific behavior of your function. Ensure the test fails initially, then write the minimum production code needed to make it pass.

Does test-driven development work for fixing existing bugs?▼

Yes, test-driven development works for fixing existing bugs. You write a test capturing the bug's incorrect behavior, verify it fails, and then fix the production code to ensure the test passes reliably.