Is this skill compatible with TypeScript?

Yes, all provided configurations, test factories, and implementation patterns are designed for modern TypeScript-based Express applications.

What testing frameworks are supported by this skill?

This skill primarily focuses on Vitest for unit testing and Supertest for integration testing within the Express.js and Node.js ecosystem.

Can I use this for mocking databases?

Yes, it includes specific patterns for mocking repositories and using libraries like jest-mock-extended to isolate your services from the database layer during tests.

Does it cover authentication testing?

Absolutely. It provides specialized patterns for testing JWT middleware and protected routes to ensure your API security logic works as intended.

How does it handle testing for error cases?

The skill includes templates for testing global error handlers, custom AppErrors, and validating that sensitive details are hidden in production environments.

Express API Testing Patterns

Name: Express API Testing Patterns
Author: karchtho

bykarchtho

Security & Testing

Implements comprehensive testing strategies for Express.js applications including unit, integration, and middleware tests.

About

This skill provides Claude with standardized patterns and best practices for testing Express.js backends. It covers the full testing pyramid from unit testing services and repositories with Vitest to integration testing API endpoints using Supertest. It includes specialized guidance for mocking databases, validating middleware behavior, testing authentication flows, and building robust test factories, ensuring your Node.js APIs are reliable, maintainable, and bug-free.

Key Features

0 GitHub stars
Scalable test factories and builders for generating consistent mock data
Integration testing strategies for RESTful API endpoints and status codes
Middleware testing templates for authentication and error handling logic
Patterns for mocking database repositories and external service dependencies
Standardized Vitest and Supertest configurations for Node.js environments

Use Cases

Writing regression tests for API routes to ensure high code coverage
Setting up a complete testing suite for a new Express.js microservice
Mocking complex database interactions and JWT authentication in unit tests

About

Key Features

0 GitHub stars
Scalable test factories and builders for generating consistent mock data
Integration testing strategies for RESTful API endpoints and status codes
Middleware testing templates for authentication and error handling logic
Patterns for mocking database repositories and external service dependencies
Standardized Vitest and Supertest configurations for Node.js environments

Use Cases

Writing regression tests for API routes to ensure high code coverage
Setting up a complete testing suite for a new Express.js microservice
Mocking complex database interactions and JWT authentication in unit tests