AI Agent Skills

Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?

Use cypress.io or playwright.dev with your rails application. This Ruby gem lets you use your regular Rails test setup and clean-up, such as FactoryBot.

Tests in real browsers via Chrome DevTools MCP. Use when building or debugging anything that runs in a browser. Use when you need to inspect the DOM, capture console err…

DO NOT USE when the target already consumes an injected interface or built-in abstraction such as IFileSystem or TimeProvider, even if the request says "generate a wrapp…