How does this skill handle TDD?

It follows a strict Red-Green-Refactor cycle where tests are written by the 'Senior Dev' persona before implementation to define expected behavior.

Can it test asynchronous code?

Yes, it includes specialized templates and strategies for testing async functions, promises, and error-handling in asynchronous workflows.

Why does it suggest avoiding CSS testing?

Testing CSS classes is often brittle; this skill prioritizes testing functional behavior and accessibility over visual implementation details that change frequently.

What testing patterns are supported?

It primarily utilizes the AAA (Arrange-Act-Assert) pattern and adheres to FIRST principles: Fast, Independent, Repeatable, Self-validating, and Timely.

Does it support mocking dependencies?

Absolutely. It provides comprehensive strategies for dependency injection mocking, module-level mocking, and time-dependent function mocking.

Unit Testing & TDD Professional

Name: Unit Testing & TDD Professional
Author: marcel-Ngan

bymarcel-Ngan

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Security & Testing

Implements robust unit testing suites and Test-Driven Development (TDD) workflows to ensure code reliability and quality.

About

This skill empowers Claude to act as a seasoned software engineer by applying industry-standard unit testing principles such as the AAA (Arrange-Act-Assert) pattern and FIRST principles. It facilitates a complete TDD lifecycle—writing failing tests first (Red), implementing the minimal code to pass (Green), and refactoring for code cleanliness. It provides comprehensive templates for functions, classes, and async code while emphasizing behavioral testing over brittle implementation details, ensuring long-term project maintainability and high test coverage.

Key Features

1 GitHub stars
Standardized AAA (Arrange-Act-Assert) test structure
Anti-pattern detection to avoid brittle styling and implementation tests
Full TDD lifecycle management (Red/Green/Refactor)
Detailed coverage guidelines for critical and non-critical paths
Advanced mocking strategies for dependencies, modules, and time

Use Cases

Writing unit tests before implementing new business logic in a TDD workflow
Creating regression tests to validate bug fixes and prevent future occurrences
Refactoring legacy codebases with confidence by establishing high test coverage

About

Key Features

1 GitHub stars
Standardized AAA (Arrange-Act-Assert) test structure
Anti-pattern detection to avoid brittle styling and implementation tests
Full TDD lifecycle management (Red/Green/Refactor)
Detailed coverage guidelines for critical and non-critical paths
Advanced mocking strategies for dependencies, modules, and time

Use Cases

Writing unit tests before implementing new business logic in a TDD workflow
Creating regression tests to validate bug fixes and prevent future occurrences
Refactoring legacy codebases with confidence by establishing high test coverage