Can this skill help with React or Vue component testing?

Yes, it includes patterns and best practices for using Testing Library to verify frontend components and user interactions effectively.

How does this skill handle mocking complex dependencies?

It provides three distinct patterns: module mocking, dependency injection for testability, and function spying to ensure isolated and predictable tests.

Does it support Test-Driven Development (TDD)?

Yes, the skill is designed to support TDD and BDD workflows by providing clear patterns for writing tests before implementation logic.

Is this skill suitable for existing projects?

Absolutely. It can be used to refactor existing test suites, improve coverage, or introduce standardized testing infrastructure to legacy JavaScript/TypeScript codebases.

Which testing frameworks does this skill support?

This skill primarily supports Jest and Vitest, providing detailed configuration and implementation patterns for both frameworks within TypeScript projects.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: HermeticOrmus

byHermeticOrmus

0•

Security & Testing

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

This skill provides comprehensive guidance for setting up and implementing testing workflows in JavaScript and TypeScript applications. It covers essential patterns for unit, integration, and end-to-end testing using industry-standard tools like Jest, Vitest, and Testing Library. Whether you are building new test infrastructure, mocking complex dependencies, or adopting Test-Driven Development (TDD), this skill helps ensure code reliability and quality through best practices in modular testing, dependency injection, and asynchronous function verification.

Key Features

01Best practices for implementing Test-Driven Development (TDD) workflows

020 GitHub stars

03Advanced mocking patterns for modules, APIs, and external dependencies

04Comprehensive strategies for testing asynchronous operations

05Automated configuration templates for Jest and Vitest environments

06Standardized unit testing structures for pure functions and classes

Use Cases

01Implementing isolated unit tests for complex business logic and services

02Configuring test infrastructure for new TypeScript projects

03Mocking third-party libraries and external APIs for reliable CI/CD pipelines

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hermeticormus/hermetic-academy javascript-testing-patterns

For use in Claude.ai and ChatGPT

Download Skill