Since Xcode 7 we have a nice API for UI testing.
Mostly I'm satisfied with it. The only concern is related to the speed.
In the beginning an ordinary UI test case (about 15 actions) ran approximately 25 seconds. Then I mocked networking completely. Now it takes 20 seconds. Considering the fact that the time is taken only by animations and a launch time (1 second or even less), I assume, there must be a way to speed it up.
Try setting this property when your UI tests run:
UIApplication.sharedApplication().keyWindow?.layer.speed = 100
There's a few more handy tips in this blog post.