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test-driven-development

Drive feature development with a red-green-refactor test-first workflow.

1|Updated Mar 22, 2026
Search Tags:#testing#tdd#red-green-refactor#unit-testing#software-engineering#test-driven-development
One-click install
npx skills add https://github.com/yt8766/learning-agent-core --skill test-driven-development-yt8766
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/yt8766/learning-agent-core/tree/main/.agents/skills/test-driven-development
Command: npx skills add https://github.com/yt8766/learning-agent-core --skill test-driven-development-yt8766

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Teams often implement features without validating behavior via tests, leading to hidden regressions and fragile code. This skill codifies Test-Driven Development (TDD) as a disciplined practice that ensures new code behavior is defined by tests before production changes.

Core Features & Use Cases

  • Red-Green-Refactor cycle: drive design by writing failing tests first, then implement minimal production code that passes.
  • Consistent guidance for feature work, bug fixes, and refactors to avoid regressions.
  • Clear approach to test-first development, preventing speculative changes and improving maintainability.

Quick Start

Start by writing a failing test that captures the desired behavior, run the tests to confirm failure, implement the minimal production code to make the test pass, then refactor while keeping all tests green.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema
How do I implement test-driven development to prevent regressions in new features?▼

Test-driven development prevents regressions by enforcing a red-green-refactor workflow where you write a failing test first, implement minimal production code to pass it, then refactor while keeping tests green.

What is the red-green-refactor cycle in unit testing?▼

The red-green-refactor cycle in unit testing is a workflow where you write a failing test, implement the minimal code to make it pass, and then refactor the implementation while maintaining passing tests.

How do I apply test-first development when fixing bugs or refactoring code?▼

Test-first development applies to bug fixes and refactors by requiring you to write a failing test capturing the desired behavior before changing any production code, validating behavior changes through real tests.

Can I use this test-driven development approach for any software engineering project?▼

Yes, this test-driven development approach applies across software projects and teams, providing consistent guidance for feature work, bug fixes, refactors, and behavior changes to avoid hidden regressions.

Why should I write failing tests before implementing production code?▼

Writing failing tests before production code prevents speculative changes by defining exact behavior expectations upfront, ensuring code quality and improving maintainability through disciplined test-first development.

What are the limitations of driving development with tests first?▼

Driving development with tests first requires disciplined adherence to the minimal code pass rule and may slow initial feature delivery, but it prevents fragile code and hidden regressions across software projects.

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