TDD Service

Guide developers through implementing services with Test-Driven Development.

1|Updated Feb 22, 2026

Search Tags:#code quality #testing #tdd #refactoring #python #service development

Ready to run

npx skills add https://github.com/arugo11/sit-copilot --skill tdd-service

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: TDD Service
Source: https://github.com/arugo11/sit-copilot/tree/main/.claude/skills/tdd-service
Command: npx skills add https://github.com/arugo11/sit-copilot --skill tdd-service

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires pytest, ruff, ty, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps developers implement new services following the Test-Driven Development (TDD) methodology, ensuring code quality and maintainability from the start.

Core Features & Use Cases

Protocol-First Design: Define service contracts using Python Protocols before implementation.
Test Structure: Provides a clear template for unit tests, including fixtures and AAA pattern.
Workflow Guidance: Outlines the Red-Green-Refactor cycle and coverage targets.
Use Case: When starting a new feature that requires a backend service, use this Skill to guide the development process, writing tests before writing the actual service code to ensure it meets requirements and is easily testable.

Quick Start

Use the TDD Service skill to create a new service named 'user_service' following the protocol-first approach.

Frequently Asked Questions about TDD Service

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

FAQPage Schema

How do I implement a Python service using Test-Driven Development?▼

To implement a Python service using Test-Driven Development, this Skill guides you through a protocol-first design approach, defining service contracts before implementation and following the Red-Green-Refactor cycle to ensure code quality.

What is protocol-first design in TDD service development?▼

Protocol-first design in TDD service development involves defining service contracts using Python Protocols before writing actual implementation code. This approach ensures your service meets requirements and remains easily testable from the start.

How do I structure unit tests with fixtures and the AAA pattern in Python?▼

To structure unit tests with fixtures and the AAA pattern in Python, this Skill provides a clear template that organizes tests into Arrange, Act, and Assert sections, ensuring maintainable and high-coverage test paths for service methods.

Does this TDD approach work with pytest for Python service development?▼

Yes, this TDD approach works with pytest for Python service development. It leverages pytest for structured unit testing, guiding the Red-Green-Refactor cycle to achieve high test coverage targets for both service methods and error handling paths.

What is the best way to start a new backend service feature with TDD?▼

The best way to start a new backend service feature with TDD is to define the protocol contract first, then write structured unit tests before the actual service code. This ensures requirements are met and the codebase remains maintainable.

When should I not use the Red-Green-Refactor cycle for service development?▼

You should reconsider using the Red-Green-Refactor cycle for service development when a feature requires rapid prototyping without strict contract definitions, as this TDD approach enforces protocol-first design and high test coverage targets from the beginning.