Does this skill support both Vitest and Jest?

Yes, it provides comprehensive syntax and best practices for both Vitest and Jest testing environments.

How does it handle external dependencies in tests?

It utilizes advanced mocking strategies, including mocks, stubs, spies, and fakes to isolate the code under test and simulate external behaviors.

Can it help with Test-Driven Development (TDD)?

Absolutely, it is designed to guide you through the Red-Green-Refactor cycle to ensure your code is testable from the start.

Does it provide guidance on test organization?

Yes, it covers file structure, co-location, naming conventions, and maintaining test isolation to ensure a clean and scalable codebase.

Unit Testing Expert

Name: Unit Testing Expert
Author: anton-abyzov

byanton-abyzov

•

Security & Testing

Implements production-grade unit testing strategies using Vitest and Jest, specializing in TDD, mocking, and coverage analysis.

The Unit Testing Expert skill transforms Claude into a specialized QA and software testing companion, focused on the Vitest and Jest ecosystems. It provides deep expertise in Test-Driven Development (TDD) cycles, sophisticated mocking strategies, and robust test architecture patterns like AAA (Arrange-Act-Assert) and Given-When-Then. Whether you are building complex asynchronous logic or simple utility functions, this skill ensures your codebase is resilient by guiding the creation of maintainable, high-coverage unit tests and helping you avoid common pitfalls like test interdependence or fragile assertions.

Key Features

01Advanced mocking, stubbing, and spying techniques

0213 GitHub stars

03TDD workflow implementation (Red-Green-Refactor)

04Code coverage analysis and threshold optimization

05Snapshots and parametric testing for complex data

06Asynchronous and error-handling test patterns

Use Cases

01Refactoring legacy code with confidence using comprehensive test suites

02Implementing TDD workflows to improve software design and maintainability

03Writing high-coverage unit tests for new or existing features

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add anton-abyzov/specweave unit-testing-expert

For use in Claude.ai and ChatGPT

Download Skill