Does this skill support both Jest and Vitest?

Yes, it provides full configuration templates and implementation patterns for both Jest and Vitest frameworks.

Is this skill optimized for TypeScript?

Yes, all provided patterns, configurations, and code examples are designed with first-class TypeScript support in mind.

Can I use this for frontend component testing?

Absolutely, it includes patterns for using Testing Library to validate React, Vue, and other modern frontend components.

How does it handle external API calls during tests?

It provides specific patterns for mocking global fetch calls and module-based HTTP clients like axios to ensure your tests remain isolated and fast.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: HermeticOrmus

byHermeticOrmus

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Security & Testing

Implements robust testing strategies using Jest and Vitest to ensure code quality in JavaScript and TypeScript applications.

This skill provides a comprehensive framework for implementing high-quality testing suites in JavaScript and TypeScript environments. It offers standardized patterns for unit testing pure functions, classes, and asynchronous code, along with advanced mocking strategies and dependency injection techniques. Whether setting up new project infrastructure with Jest or Vitest or refining existing TDD/BDD workflows, this skill ensures consistent, maintainable, and highly covered codebases through battle-tested testing practices and modern framework configurations.

Key Features

01Comprehensive configuration templates for Jest and Vitest environments

02Standardized patterns for testing pure functions, classes, and async logic

03Advanced mocking techniques for modules, global APIs, and external dependencies

04Implementation guides for Test-Driven Development (TDD) and BDD workflows

051 GitHub stars

06Integration patterns for Testing Library and frontend component validation

Use Cases

01Refactoring legacy code with robust unit and integration test coverage

02Bootstrapping test infrastructure for new TypeScript or JavaScript projects

03Mocking complex external API responses and side effects for isolated testing

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hermeticormus/floraheritage javascript-testing-patterns

For use in Claude.ai and ChatGPT

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