这是我的简单测试用例:importXCTest@testableimportMyApp//itdoesn'twork因为这个:classTabBarControllerTests:XCTestCase{overridefuncsetUp(){super.setUp()letdefaults=NSUserDefaults.standardUserDefaults()defaults.setObject([],forKey:DBTabBarOrderedIndexesKey)//keyisundefined,becauseoflackofmyappmoduledefaults.synchr