参考链接:
WWDC15 Session笔记 - Xcode 7 UI 测试初窥:https://onevcat.com/2015/09/ui-testing/
Xcode 7智能测试化工具XCTestCase学习 :http://www.jianshu.com/p/f4ba532caed0
About Testing with Xcode:https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/testing_with_xcode/chapters/01-introduction.html#//apple_ref/doc/uid/TP40014132-CH1-SW1