Does this skill support both Jest and Vitest?

Yes, it includes comprehensive configurations and implementation patterns for both the traditional Jest framework and the modern, Vite-native Vitest framework.

Is this skill compatible with TypeScript projects?

Yes, all examples, configurations, and patterns are fully optimized for TypeScript, including proper type definitions for tests, mocks, and fixtures.

Can I use this for frontend component testing?

Absolutely. While it focuses on core logic, the patterns are designed to work alongside Testing Library for React, Vue, and other UI frameworks.

How does it handle external API dependencies during tests?

The skill provides specific patterns for mocking modules and the global fetch API, allowing you to simulate API responses reliably without making real network calls.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: amurata

byamurata

•

Security & Testing

Implements comprehensive testing strategies using Jest and Vitest to ensure robust JavaScript and TypeScript application quality.

About

JavaScript Testing Patterns is a specialized skill designed to streamline the implementation of professional testing suites across JavaScript and TypeScript projects. It provides Claude with the patterns and configurations necessary for unit, integration, and end-to-end testing using modern frameworks like Jest and Vitest. By leveraging best practices for mocking, dependency injection, and test-driven development (TDD), this skill helps developers build resilient software, improve code coverage, and establish automated testing pipelines that catch regressions early in the development lifecycle.

Key Features

Advanced mocking strategies for modules, APIs, and external dependencies
Implementation guides for asynchronous testing and spy patterns
Pre-configured setup patterns for Jest and Vitest frameworks
Comprehensive unit testing patterns for pure functions and classes
Ready-to-use coverage threshold configurations for CI/CD integration
3 GitHub stars

Use Cases

Implementing Test-Driven Development (TDD) workflows for complex business logic
Refactoring legacy codebases by systematically adding unit and integration test coverage
Bootstrapping test infrastructure for new TypeScript microservices or frontend applications

About

Key Features

Advanced mocking strategies for modules, APIs, and external dependencies
Implementation guides for asynchronous testing and spy patterns
Pre-configured setup patterns for Jest and Vitest frameworks
Comprehensive unit testing patterns for pure functions and classes
Ready-to-use coverage threshold configurations for CI/CD integration
3 GitHub stars

Use Cases

Implementing Test-Driven Development (TDD) workflows for complex business logic
Refactoring legacy codebases by systematically adding unit and integration test coverage
Bootstrapping test infrastructure for new TypeScript microservices or frontend applications