Can this skill help with mocking external APIs?

Yes, it includes specific patterns for mocking global fetch, external modules, and complex class dependencies using spies and mocks.

Does it support TypeScript-specific testing?

Absolutely. All provided patterns and configurations are optimized for TypeScript with full type safety and ts-jest/vitest compatibility.

Which testing frameworks are supported by this skill?

This skill primarily focuses on Jest and Vitest, covering both traditional environments and modern Vite-based projects.

How does this skill facilitate TDD workflows?

The skill provides the structure and boilerplate needed to write tests before implementation, ensuring a robust Test-Driven Development cycle.

Is it suitable for frontend component testing?

Yes, it includes patterns that integrate with Testing Library for React, Vue, and other component-based frameworks to test user flows.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: HermeticOrmus

byHermeticOrmus

Security & Testing

Implements professional testing strategies for JavaScript and TypeScript applications using frameworks like Jest and Vitest.

About

JavaScript Testing Patterns provides a comprehensive framework for building reliable software through unit, integration, and end-to-end testing. It offers standardized implementation patterns for mocking dependencies, testing asynchronous code, and setting up robust test environments. Whether you're practicing Test-Driven Development (TDD) or adding coverage to an existing codebase, this skill guides Claude in creating maintainable test suites that ensure application stability across modern JS/TS ecosystems.

Key Features

Dependency Injection implementation for enhanced testability
Asynchronous testing patterns for APIs and services
Comprehensive unit testing for pure functions and classes
0 GitHub stars
Advanced mocking strategies for modules and external APIs
Standardized Jest and Vitest configuration patterns

Use Cases

Setting up test infrastructure for new TypeScript projects
Implementing mocking for external third-party dependencies
Automating unit tests for complex business logic and services

About

Key Features

Dependency Injection implementation for enhanced testability
Asynchronous testing patterns for APIs and services
Comprehensive unit testing for pure functions and classes
0 GitHub stars
Advanced mocking strategies for modules and external APIs
Standardized Jest and Vitest configuration patterns

Use Cases

Setting up test infrastructure for new TypeScript projects
Implementing mocking for external third-party dependencies
Automating unit tests for complex business logic and services