Unit test and cocoapods on XCode 7

I am trying to use unit test on my app.

My app works well on simulator and device when running.

But when i want to use unit test, i have this error :

'Google/CloudMessaging.h' file not found

I have tried this to add this line in my podfile with no success :

link_with 'App-Ely', 'App-ElyTests'

What can i do to run my units tests?