What is the AAA pattern mentioned in the skill?

AAA stands for Arrange, Act, and Assert. It is a pattern that organizes tests into three distinct blocks: preparing the data, executing the target method, and verifying the result.

Can I use this skill for bug fixing?

Yes. The skill encourages writing a failing test case that reproduces the bug (Red) before writing any code to fix it, ensuring the bug is truly resolved and won't regress.

What is the TDD Wada Style skill?

It is a specialized capability for Claude Code that implements the Test-Driven Development philosophy of Takuto Wada, focusing on the Red-Green-Refactor cycle and behavioral testing.

How does this skill help with refactoring?

It ensures that you have a 'Green' test state before you begin, then guides you through structural improvements while ensuring that the external behavior remains unchanged and the tests stay passing.

TDD Wada Style

Name: TDD Wada Style
Author: YunosukeYoshino

byYunosukeYoshino

0•

Security & Testing

Implements high-quality software using the Red-Green-Refactor cycle and behavior-driven test patterns inspired by Takuto Wada's philosophy.

This skill integrates Takuto Wada’s (t.wada) renowned TDD philosophy into Claude’s coding workflow, treating tests as a design tool rather than just a verification step. It guides the development process through the disciplined Red-Green-Refactor cycle, enforces the Arrange-Act-Assert (AAA) structure, and prioritizes testing behavior over implementation details. This approach ensures that your codebase remains maintainable, provides living documentation through tests, and achieves high reliability through rigorous boundary and error-case coverage.

Key Features

01Comprehensive boundary value and exception handling test generation

020 GitHub stars

03Behavioral requirement decomposition using 'when/then' patterns

04Automated Red-Green-Refactor workflow management

05Refactoring guidance to improve design without altering external behavior

06Strict enforcement of the Arrange-Act-Assert (AAA) test structure

Use Cases

01Developing new features with a test-first approach to ensure clean API design

02Standardizing test suites across a team using the AAA pattern and Japanese behavioral descriptions

03Safe refactoring of complex logic by establishing a behavioral test safety net first

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yunosukeyoshino/imagescraper tdd

For use in Claude.ai and ChatGPT

Download Skill