`@testable import` in UI Tests fail to link to app

Hi,

Is functional testing supported in UI Test ?

I'd like to check the state of my application is correct in a UI Test function (like I have done in my functional tests in the Unit Test target), however adding `@testable import MyApp` causes a link time error:

Undefined symbols for architecture x86_64:
  "type metadata accessor for MyApp.MainViewController", referenced from:
      MyAppUITests.MyAppUITests.setUp (MyAppUITests.MyAppUITests)() -> () in MyAppUITests.o
      type metadata accessor for MyApp.MainViewController? in MyAppUITests.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I noticed that `UIApplication.sharedApplication().windows` also returns an empty array.

Has access to the app been removed from UI Test targets?

Cheers,

Daniel