with previous versions of Android Studio working properly with Release Candidate 4 (December 4th) or newer:
FATAL EXCEPTION: main java.lang.NoClassDefFoundError: com.google.android.gms.location.LocationClient
it seems to me that it is related to update
This looks similar: https://github.com/robolectric/robolectric/issues/1136
working : compile 'com.google.android.gms:play-services:6.1.+'
This has nothing to do with gradle. It's an update for Google Play Services. The
LocationClient class has been replaced with the new
Check this answer: Android play services 6.5: LocationClient is missing