XCUITest is a test automation framework used for UI testing of mobile apps and web applications on iOS devices, developed by Apple. It provides a framework for programmatically identifying and interacting with UI elements from other testing tools, replacing the older UIAutomator technology. XCUITest aims to ensure a positive end-user experience by driving further functional testing. The framework follows basic patterns for UI tests, including recording or capturing app responses, measuring response against expected responses, and reporting results. XCUITest has close integration with XCode, allowing developers to write unit, integration, and UI tests in the same language, edited entirely within XCode, and stored in the same repository. The framework also allows for flexible element identification and accessibility testing. However, it is constrained by its iOS-only compatibility and requires XCode installation on every machine where it is run, which can limit scalability and flexibility.