摘要：
1https://developer.apple.com/library/ios/#documentation/DeveloperTools/Conceptual/UnitTesting/02-Setting_Up_Unit_Tests_in_a_Project/setting_up.html#//apple_ref/doc/uid/TP40002143-CH3-SW1 单元测试GUIDE：介绍、逻辑单元测试应用程序法单元测试相互转换方法。2https://developer.apple.com/library/ios/#documentation/DeveloperTools/Referen 阅读全文
