Does this skill support both Jest and Vitest?

Yes, it includes configuration patterns and specific test implementations for both Jest and Vitest frameworks.

How does it support TDD workflows?

The skill guides Claude to follow Red-Green-Refactor patterns and write comprehensive test cases before generating implementation code.

Can I use this for frontend component testing?

Absolutely, it provides patterns for using Testing Library with modern frontend frameworks like React and Vue.

Does it help with mocking external APIs?

Yes, it includes specific patterns for mocking global fetch, third-party modules, and complex class dependencies.

Is it compatible with TypeScript projects?

Yes, all patterns, configurations, and code examples are fully optimized for both JavaScript and TypeScript environments.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: EricGrill

byEricGrill

•

Security & Testing

Implements comprehensive testing strategies for JavaScript and TypeScript applications using modern frameworks and best practices.

This skill provides Claude with advanced expertise in modern JavaScript and TypeScript testing ecosystems, specifically focusing on Jest and Vitest. It enables the generation of robust unit, integration, and end-to-end tests while adhering to professional standards like Test-Driven Development (TDD) and the Testing Library philosophy. This skill is ideal for developers looking to establish high-quality test infrastructures, implement complex mocking strategies for external dependencies, or automate rigorous validation patterns within their CI/CD pipelines.

Key Features

01Advanced mocking patterns for modules, global fetch, and class dependencies

02Comprehensive coverage reporting and CI/CD integration setups

03Implementation guides for Unit, Integration, and E2E testing layers

042 GitHub stars

05Framework-agnostic support for both Jest and Vitest configurations

06Test-Driven Development (TDD) and BDD workflow automation

Use Cases

01Mocking complex external API services to isolate business logic in unit tests

02Setting up a high-performance Vitest environment for a new TypeScript project

03Implementing integration tests for UI components using Testing Library

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add ericgrill/agents-skills-plugins javascript-testing-patterns

For use in Claude.ai and ChatGPT

Download Skill