Does this skill support both Jest and Vitest?

Yes, it provides optimized configuration setups and code patterns for both Jest (standard) and Vitest (Vite-native) testing frameworks.

Is it compatible with TypeScript?

Yes, the skill is fully optimized for TypeScript, including interface mocking and type-safe test implementations.

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

Yes, it is designed to facilitate TDD and BDD workflows by providing clear structures for assertions, expectations, and test suites.

Can I use this for mocking API calls and external modules?

Absolutely. The skill includes specific patterns for mocking global fetch, module imports (like nodemailer), and spying on function calls.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: GaitanS

byGaitanS

Security & Testing

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

About

This skill empowers Claude with specialized knowledge for architecting and implementing comprehensive test suites in JavaScript and TypeScript environments. It provides standardized patterns for unit, integration, and end-to-end testing, utilizing industry-standard tools like Jest, Vitest, and Testing Library. Whether you are setting up a new project's infrastructure, mocking complex external dependencies, or adopting a Test-Driven Development (TDD) workflow, this skill ensures your code remains reliable, maintainable, and highly covered through advanced mocking, spying, and dependency injection patterns.

Key Features

Advanced mocking patterns for modules, APIs, and external services
Implementation of Dependency Injection for improved testability
0 GitHub stars
Standardized configuration for Jest and Vitest environments
Comprehensive strategies for testing asynchronous functions and classes
Pre-configured coverage thresholds and CI/CD ready setups

Use Cases

Refactoring existing codebases to include better integration tests and mocks
Generating automated unit tests for complex business logic and pure functions
Implementing TDD workflows to ensure high code quality from the start of development

About

Key Features

Advanced mocking patterns for modules, APIs, and external services
Implementation of Dependency Injection for improved testability
0 GitHub stars
Standardized configuration for Jest and Vitest environments
Comprehensive strategies for testing asynchronous functions and classes
Pre-configured coverage thresholds and CI/CD ready setups

Use Cases

Refactoring existing codebases to include better integration tests and mocks
Generating automated unit tests for complex business logic and pure functions
Implementing TDD workflows to ensure high code quality from the start of development