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test-driven-development

Guide test-first development through a red-green-refactor cycle.

Updated Aug 23, 2026
Search Tags:#tdd#red-green-refactor#unit-testing#quality-assurance#software-engineering#test-driven-development
One-click install
npx skills add https://github.com/Hanseooo/hanseo-opencode-workflows --skill test-driven-development-hanseooo
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/Hanseooo/hanseo-opencode-workflows/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/Hanseooo/hanseo-opencode-workflows --skill test-driven-development-hanseooo

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Enables teams to improve software quality by enforcing a test-first approach: you write tests before implementing code to clarify requirements and prevent regressions.

Core Features & Use Cases

  • Provides a repeatable Red-Green-Refactor cycle to guide feature development, bug fixes, and refactoring.
  • Teaches discipline for writing meaningful tests that drive design and catch regressions early.
  • Useful for onboarding new codebases and establishing a safe development rhythm.

Quick Start

Start the TDD cycle by writing a failing test, then implement the minimum code to pass, and repeat until the test suite passes.

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 test-first approach where you write a failing test, implement the minimum code to pass it, and then refactor safely. This red-green-refactor cycle clarifies requirements and prevents regressions before production code is written.

How do I start writing tests before implementing new features?▼

Start test-driven development by writing a failing test that defines the desired behavior for your feature. Implement just enough code to make it pass, then repeat the cycle until your test suite succeeds, ensuring safe incremental changes.

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

Yes, test-first development applies to bug fixes and refactoring across software projects. By writing tests that define behavior before changing implementation, you establish guardrails for safe incremental changes and catch regressions early.

Does test-driven development require a specific unit-testing framework to work?▼

Test-driven development does not depend on specific frameworks. It enforces a reproducible red-green-refactor cycle and requires writing real tests before production code, which can be applied using standard unit-testing tools in any software engineering environment.

When should I not use a test-first approach for software development?▼

You should avoid test-driven development when rapid prototyping without defined requirements is needed. It requires discipline to write meaningful tests that drive design, making it less suited for exploratory spikes where behavior is not yet clear.

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