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test-driven-development

Enforce a red-green-refactor cycle with failing tests before implementation.

Updated Apr 15, 2026
Search Tags:#tdd#red-green-refactor#code-quality#quality-assurance#test-driven-development#software-testing
One-click install
npx skills add https://github.com/YangYuS8/dev-2026-grading --skill test-driven-development-yangyus8
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/YangYuS8/dev-2026-grading/tree/main/.opencode/skills/test-driven-development
Command: npx skills add https://github.com/YangYuS8/dev-2026-grading --skill test-driven-development-yangyus8

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing production code without tests can lead to undetected bugs and unclear requirements. TDD helps clarify intent by externalizing expectations through tests before implementation.

Core Features & Use Cases

  • Red-Green-Refactor loop: write a failing test, implement just enough code, then refactor.
  • Safety through small steps: incremental changes reduce risk and make regressions obvious.
  • Use Case: when adding a new feature or fixing a bug, you start with a failing test and only implement what is necessary to pass.

Quick Start

Write a failing test first, then implement the minimal code to pass it.

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 it prevent regressions?▼

Test-driven development is a technique enforcing tests-before-implementation to prevent unverified features. By externalizing expectations through failing tests first, it clarifies intent and makes regressions obvious during incremental changes.

How do I apply the red-green-refactor cycle when adding a new feature?▼

To apply the red-green-refactor cycle, write a failing test first, implement the minimal production code required to pass it, and then continuously refactor. This incremental approach reduces risk and guides teams through feature development safely.

Can I use test-driven development for fixing bugs, not just new features?▼

Yes, test-driven development applies across both feature development and bug fixes. When fixing a bug, you start by writing a failing test that captures the defect, then implement only the necessary code to make it pass.

What's the best way to ensure code quality when writing production code?▼

The best way to ensure code quality is by adopting test-driven development. This methodology requires writing a failing test before production code, implementing minimal behavior to pass, and refactoring, which prevents unverified features and undetected bugs.

Do I need any specific testing frameworks to start writing tests before implementation?▼

No specific testing frameworks are required to start writing tests before implementation. The test-driven development methodology is framework-agnostic, focusing on the process of writing failing tests, minimal code, and refactoring to ensure bug-free outputs.

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