Does this skill support Vitest?

Yes, it includes specific configuration patterns and examples for Vitest as well as Jest, ensuring compatibility with modern Vite-based projects.

How does it handle asynchronous code?

The skill includes specialized patterns for testing async functions, resolving promises, and mocking global fetch or network-bound services.

Can I use this for frontend component testing?

Absolutely, it provides patterns suitable for React, Vue, and other UI frameworks using Testing Library and DOM-based test environments.

Is it compatible with TypeScript?

Yes, all examples, configurations, and implementation patterns are optimized for both JavaScript and TypeScript environments, including type-safe mocking.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: 3commas-io

by3commas-io

Security & Testing

Implements robust JavaScript and TypeScript testing strategies using modern frameworks like Jest, Vitest, and Testing Library.

About

This skill provides a comprehensive set of patterns and best practices for testing JavaScript and TypeScript applications. It guides Claude through setting up test infrastructure, writing unit and integration tests, and implementing advanced mocking strategies with Jest and Vitest. Whether you are practicing TDD, mocking external APIs, or testing complex asynchronous logic, this skill ensures your codebase remains reliable and maintainable through high-quality test coverage and standardized implementation patterns.

Key Features

Dependency injection strategies for testable architecture
0 GitHub stars
Comprehensive async testing and API mocking patterns
Standardized patterns for testing pure functions and classes
Automated configuration for Jest and Vitest environments
Advanced mocking techniques for modules and external dependencies

Use Cases

Setting up a new testing suite for a TypeScript project
Implementing Test-Driven Development (TDD) workflows
Mocking external API calls and third-party services

About

Key Features

Dependency injection strategies for testable architecture
0 GitHub stars
Comprehensive async testing and API mocking patterns
Standardized patterns for testing pure functions and classes
Automated configuration for Jest and Vitest environments
Advanced mocking techniques for modules and external dependencies

Use Cases

Setting up a new testing suite for a TypeScript project
Implementing Test-Driven Development (TDD) workflows
Mocking external API calls and third-party services