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test-driven-development

Guide feature development with a failing test before production code.

1|Updated Dec 8, 2023
Search Tags:#testing#tdd#red-green-refactor#unit-testing#software-development
One-click install
npx skills add https://github.com/hydrosolutions/SAPPHIRE_Forecast_Tools --skill test-driven-development-hydrosolutions
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/hydrosolutions/SAPPHIRE_Forecast_Tools/tree/main/.claude/skills/test-driven-development
Command: npx skills add https://github.com/hydrosolutions/SAPPHIRE_Forecast_Tools --skill test-driven-development-hydrosolutions

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Test-driven development enforces a test-first workflow to prevent defects by ensuring a failing test exists before writing production code.

Core Features & Use Cases

  • Red-Green-Refactor cycle: guide minimal, verifiable implementation.
  • Strong regression guardrails: catch issues early and document intended behavior through tests.
  • Behavior-driven design: shape code around observable outcomes and maintainability.

Quick Start

Begin every feature with a failing test, then implement only enough production code to pass and repeat.

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 workflow where you write a failing test, implement minimal production code to pass it, then refactor. This red-green-refactor cycle validates behavior and prevents regressions before implementation.

How do I start writing unit tests first for a new software feature?▼

Begin every feature with a failing unit test that defines expected behavior. Implement only enough production code to make the test pass, then refactor while ensuring the test stays green throughout the cycle.

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

Yes, test-driven development applies across feature development, bug fixes, and refactoring. Writing a failing test first documents intended behavior and provides regression guardrails when modifying existing software projects.

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

Avoid test-driven development when rapid prototyping without defined behavior expectations, or when exploratory code lacks observable outcomes. The process requires clear behavioral specifications to shape code around verifiable results.

Why does test-driven development require a failing test before writing production code?▼

Test-driven development requires a failing test first to ensure the test actually validates the target behavior. Production code exists only after a passing test, enforcing minimal implementation and preventing defect injection.

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