Xcode is an integrated development environment for macOS containing a suite of software development tools developed by Apple for developing software for macOS, iOS, watchOS, and tvOS.  XCUITest is part of the Xcode framework;  it allows you to easily develop UI tests that simulate user interaction with your application.

Learn about XCUITest and automation with Perfecto

XCUITest KIF Screenshot

Execute tests on iOS apps with the XCUITest framework and Perfecto.