This document discusses testing mobile apps on iOS 10 using Appium and XCUITest. XCUITest is Apple's new UI testing framework that was introduced in iOS 9 and supports iOS 9 and 10. It is based on XCTest and can be used from Objective C or Swift. The document provides an example of how to write a test case and make assertions using XCUITest. It notes that XCUITest is easy to learn but documentation is limited and it only supports iOS 9 and 10. The document also discusses Appium's work to support testing on iOS 10 simulators, including a major rewrite and new plugins.