What is the core rule of the TDD skill?

The core principle is that every single line of production code must be written in response to a failing test. If there is no failing test, no production code is written.

Does it focus on implementation or behavior?

It focuses strictly on behavior. Tests are designed to verify business outcomes through public APIs rather than checking internal implementation details or private methods.

How does this skill handle test data?

It advocates for the use of factory functions over 'let' or 'beforeEach' blocks to ensure test isolation, reduce shared state, and improve readability.

When should I refactor according to this skill?

Refactoring occurs only after tests are green. You must commit the working code first, then refactor while keeping the external API unchanged and all tests passing.

Test-Driven Development (TDD) Specialist

Name: Test-Driven Development (TDD) Specialist
Author: mintuz

bymintuz

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セキュリティとテスト

Enforces the Red-Green-Refactor cycle to ensure production code is only written in response to failing behavioral tests.

概要

This skill transforms Claude into a disciplined TDD practitioner, guiding the development process through the rigorous Red-Green-Refactor cycle. It prioritizes behavior-driven testing over implementation details, utilizing factory patterns for test data and ensuring high-quality code through business logic verification. By providing strict quality gates and decision trees, it prevents common pitfalls such as speculative coding, testing private methods, or using brittle setup patterns, resulting in a robust and maintainable codebase.

主な機能

Strict Red-Green-Refactor workflow enforcement
Test data management using factory patterns
Behavior-focused testing via public APIs
14 GitHub stars
Comprehensive refactoring assessment guides
Quality gate checklists for clean code commits

ユースケース

Standardizing testing patterns across web and iOS development projects
Safely refactoring complex logic while maintaining API stability
Building mission-critical features with 100% behavioral test coverage

概要

主な機能

Strict Red-Green-Refactor workflow enforcement
Test data management using factory patterns
Behavior-focused testing via public APIs
14 GitHub stars
Comprehensive refactoring assessment guides
Quality gate checklists for clean code commits

ユースケース

Standardizing testing patterns across web and iOS development projects
Safely refactoring complex logic while maintaining API stability
Building mission-critical features with 100% behavioral test coverage