Which testing frameworks does this skill support?

The skill provides comprehensive support and configuration patterns for both Jest and Vitest, the two most popular modern JavaScript testing frameworks.

Can this skill help with mocking external dependencies?

Yes, it includes specific patterns for mocking modules (like nodemailer), global fetch calls, and using dependency injection to isolate units under test.

Does it include coverage reporting setup?

Yes, the skill provides configuration examples for setting up coverage thresholds and reporting in both Jest and Vitest to ensure code quality in CI/CD.

Is this skill useful for frontend framework testing?

Absolutely. While it focuses on core JS/TS logic, the patterns provided are compatible with React Testing Library and Vue Test Utils for component-level testing.

How does this help with Test-Driven Development?

It provides Claude with the structural knowledge to write failing test cases first, defining API expectations before implementing the functional code.

JavaScript Testing Patterns

Name: JavaScript Testing Patterns
Author: HermeticOrmus

byHermeticOrmus

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セキュリティとテスト

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

概要

This skill provides specialized guidance for Claude to architect and implement robust testing suites in JavaScript and TypeScript environments. It streamlines the creation of unit, integration, and end-to-end tests by providing standardized patterns for framework configuration, dependency mocking, and async testing. Whether you are migrating to Vitest, setting up TDD workflows, or implementing complex dependency injection for better testability, this skill ensures your codebase maintains high reliability and coverage through industry-standard best practices.

主な機能

Optimized configurations for Jest and Vitest environments
Dependency injection strategies for decoupled, testable code
Integration and E2E testing patterns for complex user flows
Advanced mocking patterns for modules and external APIs
2 GitHub stars
Comprehensive unit testing for classes, pure functions, and async logic

ユースケース

Setting up modern test infrastructure for new TypeScript projects
Implementing Test-Driven Development (TDD) for critical business logic
Refactoring legacy JavaScript code to improve testability and code coverage

概要

主な機能

Optimized configurations for Jest and Vitest environments
Dependency injection strategies for decoupled, testable code
Integration and E2E testing patterns for complex user flows
Advanced mocking patterns for modules and external APIs
2 GitHub stars
Comprehensive unit testing for classes, pure functions, and async logic

ユースケース

Setting up modern test infrastructure for new TypeScript projects
Implementing Test-Driven Development (TDD) for critical business logic
Refactoring legacy JavaScript code to improve testability and code coverage