Which API clients are supported by this skill?

This skill provides guidance for Bruno, Postman, Hoppscotch, and the VS Code REST Client, favoring local-first and Git-friendly tools.

Does it help with contract testing?

Absolutely. It includes consumer-side test patterns using Pact to ensure that API providers and consumers stay in sync.

How does it handle API mocking?

The skill provides implementation details for MSW (Mock Service Worker) for node/browser environments and Prism for mocking directly from OpenAPI specifications.

Can I use this for automated testing in CI/CD?

Yes, it includes specific patterns for running tests in GitHub Actions using the Postman CLI (Newman) and other automation runners.

API Testing Expert

Name: API Testing Expert
Author: willsigmon

bywillsigmon

•

Security & Testing

Streamlines API testing workflows using modern tools like Bruno, Postman, and contract testing frameworks to ensure backend reliability.

The API Testing Expert skill provides Claude with comprehensive patterns and implementation guides for testing REST and GraphQL services. It covers everything from local-first development with Bruno and VS Code REST Client to advanced contract testing with Pact and automated CI/CD validation using Newman. By offering pre-configured structures for API collections, mock server setups with MSW, and OpenAPI mocking via Prism, this skill helps developers establish robust testing suites that maintain contract integrity and accelerate the development lifecycle.

Key Features

01CI/CD integration guides for GitHub Actions and Postman CLI (Newman)

02Contract testing implementation patterns using Pact for consumer-driven reliability

036 GitHub stars

04Mock server configuration with MSW and Prism for isolated frontend development

05Multi-tool support for Bruno, Postman, Hoppscotch, and VS Code REST Client

06Git-friendly API collection structures for improved team collaboration

Use Cases

01Automating API validation within CI/CD pipelines to catch regressions early

02Setting up mock service workers to unblock frontend development before backend completion

03Implementing contract testing to prevent breaking changes in microservice architectures

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add willsigmon/sigstack api-testing-expert

For use in Claude.ai and ChatGPT

Download Skill