[Test] Fix dispatch_after timing.
[Test] Fix dispatch_after timing.

msdgwzhy6/SwiftTask,luzefeng/SwiftTask,luzefeng/SwiftTask,luzefeng/SwiftTask,msdgwzhy6/SwiftTask,iosyoujian/SwiftTask,ReactKit/SwiftTask,msdgwzhy6/SwiftTask,ReactKit/SwiftTask,iosyoujian/SwiftTask,iosyoujian/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask,iosyoujian/SwiftTask,ReactKit/SwiftTask,msdgwzhy6/SwiftTask,marinehero/SwiftTask,luzefeng/SwiftTask