test-driven-development

Name: test-driven-development
Availability: InStock
Author: pyinx

Write failing tests before production code using the RED-GREEN-REFACTOR workflow.

14|2|Updated Jan 19, 2026

Search Tags:#tdd #red-green-refactor #unit-testing #quality-assurance #test-driven-development #testing-first

Ready to run

npx skills add https://github.com/pyinx/ceo-skills-plugin --skill test-driven-development-pyinx

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/pyinx/ceo-skills-plugin/tree/main/skills/tdd
Command: npx skills add https://github.com/pyinx/ceo-skills-plugin --skill test-driven-development-pyinx

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Ensures software changes are validated by writing tests before code, preventing silent bugs and enabling safer refactors. TDD establishes a disciplined workflow that emphasizes test coverage from the outset and reduces debugging time in later stages.

Core Features & Use Cases

Red-Green-Refactor cycle: write a failing test, make it pass, then clean up.
Test-first discipline: prevents regressions by validating behavior upfront.
Deterministic development workflow: minimal production code that satisfies tests and supports safe evolution.

Quick Start

Write a failing test that expresses the desired behavior and implement the simplest production code to make it pass.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema

What is test-driven development and how does the red-green-refactor cycle work?▼

Test-driven development is a workflow where you write a failing test, implement minimal production code to pass it, then refactor. The red-green-refactor cycle enforces this test-first discipline to prevent silent bugs and ensure safer code evolution.

How do I start writing unit tests before production code for a new feature?▼

To start writing unit tests before production code, write a failing test that expresses the desired behavior for your new feature. Then, implement the simplest deterministic production code required to make that failing test pass.

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

Yes, test-driven development is suitable for bug fixes and refactoring across any project using automated tests. Writing a failing test first validates the bug, and minimal code changes ensure deterministic behavior while preventing regressions.

What's the best way to enforce a testing-first workflow and prevent silent bugs?▼

The best way to enforce a testing-first workflow is adopting strict test-driven development. By requiring validation that tests fail first and guiding minimal production changes, it establishes deterministic development and reduces later debugging time.

Does test-driven development work with any automated testing framework?▼

Test-driven development works across any project that uses automated tests. It is framework-agnostic, focusing on the test-first discipline and minimal code changes rather than requiring specific testing tools or platform dependencies.

When should I not use a test-first approach for writing production code?▼

You should not use a test-first approach when exploring unfamiliar prototypes where behavior is non-deterministic. Test-driven development requires writing deterministic tests first, making it less suited for highly experimental or volatile code paths.