This is a comprehensive API reference for writing XCUITest UI tests in Swift 6, covering everything from basic element queries to coordinate-based gestures. You get the full rundown on XCUIApplication lifecycle management, XCUIElement interactions, and proper waiting patterns including the new waitForNonExistence in Xcode 16. The examples are practical and show real patterns like pull-to-refresh gestures, predicate-based queries, and handling @MainActor requirements. It's dense but well-organized, basically the quick reference you'd want open in a split screen while writing tests. No fluff about testing philosophy, just the API calls you need with working Swift snippets.
npx skills add https://github.com/vabole/apple-skills --skill xcuitest