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Test-Driven Development (TDD)

Guide software development through the Red-Green-Refactor cycle with failing tests.

Updated Jan 26, 2026
Search Tags:#code quality#testing#tdd#refactoring#software development#agile
One-click install
npx skills add https://github.com/Was85/ralph-rlm-agent-framework --skill test-driven-development-tdd-was85
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Test-Driven Development (TDD)
Source: https://github.com/Was85/ralph-rlm-agent-framework/tree/main/copilot-cli/skills/test-driven-development
Command: npx skills add https://github.com/Was85/ralph-rlm-agent-framework --skill test-driven-development-tdd-was85

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill enforces a rigorous Test-Driven Development (TDD) methodology to ensure code quality, prevent regressions, and document behavior through automated tests.

Core Features & Use Cases

  • Red-Green-Refactor Cycle: Guides the developer through writing a failing test, writing minimal code to pass, and then refactoring.
  • Bug Fix Workflow: Ensures bugs are fixed by first writing a test that reproduces the bug.
  • Use Case: When developing a new user authentication feature, you would first write a test for a successful login, then write the minimal code to make that test pass, and finally refactor.

Quick Start

Apply the Test-Driven Development skill to write a failing test for the new login functionality.

Frequently Asked Questions about Test-Driven Development (TDD)

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

FAQPage Schema
How do I use the Red-Green-Refactor cycle for test-driven development?▼

Test-driven development follows the Red-Green-Refactor cycle by writing a failing test, creating minimal code to pass it, and then refactoring to ensure code quality and prevent regressions.

Why does test-driven development require writing a failing test before fixing a bug?▼

Test-driven development enforces a bug fix workflow that requires writing a test to reproduce the bug first, ensuring the subsequent implementation resolves the exact issue and prevents future regressions.

What is the best way to start writing tests first for new feature development?▼

Writing tests first for new feature development involves applying the test-driven development methodology to define expected behavior through a failing test before writing any minimal implementation code.

When do I need test-driven development for refactoring tasks?▼

Test-driven development is needed for refactoring tasks to ensure existing behavior remains intact, guiding you to verify test coverage before modifying code to maintain software quality.

Does test-driven development work for agile software development workflows?▼

Test-driven development works effectively within agile software development workflows by enforcing iterative code quality checks, supporting continuous integration through automated tests, and documenting behavior incrementally.

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