I have a few projects I'm trying to build with Xcode 6 Beta 2. The projects all have some type of library that uses XCTest (Kiwi/XCTest and Specta) that don't build in Xcode 6 because XCTest/XCTest.h cannot be found.
fatal error: 'XCTest/XCTest.h' file not found
Note: This may not be needed for any projects created in Xcode 7.
In order to fix this for any CocoaPod dependencies you need to add the following to
FRAMEWORK_SEARCH_PATHS in any Pod target that requires XCTest (e.g. Kiwi, Specta, FBSnapshotTestCase, etc).
This will allow you to reference XCTest in any dependencies you may have. This may be fixed in a future update of CocoaPods, or the Pod you are referencing, so you may want to remove it later.
It is not detrimental to earlier versions of Xcode so should be safe to use.