How does it handle external API dependencies?

The skill implements sophisticated mocking patterns, including global fetch mocking, module-level overrides, and dependency injection to isolate code from external services.

Does this skill support both Jest and Vitest?

Yes, it provides specialized configurations and patterns for both frameworks, including configuration files, environment setups, and coverage thresholds.

Can I use this for testing React or Vue components?

Absolutely. It includes patterns compatible with Testing Library and provides strategies for mocking browser-based APIs and component dependencies.

Does it include guidance for code coverage?

Yes, it provides predefined coverage threshold configurations to ensure your project maintains high quality across branches, functions, and lines.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: HermeticOrmus

byHermeticOrmus

0•

Security & Testing

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

This skill provides a comprehensive toolkit for building reliable software through advanced testing patterns in the JavaScript and TypeScript ecosystem. It offers standardized configurations for Jest and Vitest, covering everything from unit testing pure functions to complex integration tests and end-to-end user flows. By providing specialized guidance on mocking external dependencies, implementing dependency injection, and setting up CI/CD-ready coverage thresholds, this skill ensures Claude generates maintainable, production-grade test suites that follow TDD and BDD best practices.

Key Features

01Pre-configured setup for Jest and Vitest environments

02Unit testing patterns for pure functions, classes, and async code

03Dependency injection patterns to improve code testability

040 GitHub stars

05Standardized spying and error-handling test cases

06Advanced mocking strategies for modules and third-party APIs

Use Cases

01Setting up a new testing infrastructure for a TypeScript project

02Implementing Test-Driven Development (TDD) for complex business logic

03Mocking external services like email transporters or REST APIs

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hermeticormus/floreserlife javascript-testing-patterns

For use in Claude.ai and ChatGPT

Download Skill