android|android robotium教程,Robotium + Android studio

问题
When I run robotium (5.2.1) tests from android studio 1.0 RC 2, I get this following error ==>
:app:shrinkDebugTestMultiDexComponents FAILED
Error:Execution failed for task ':app:shrinkDebugTestMultiDexComponents'.> java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options?
I have no problem to run the application "in normal mode".
Do you know where is my problem ?
Thx in advance
EDIT
【android|android robotium教程,Robotium + Android studio】According to Jared Burrows's answer I can pass task shrinkDebugTestMultiDexComponents but now I have this problem
:app:packageAllDebugTestClassesForMultiDex FAILED
Error:Execution failed for task ':app:packageAllDebugTestClassesForMultiDex'.> java.util.zip.ZipException: duplicate entry: android/support/multidex/BuildConfig.class
来源:https://stackoverflow.com/questions/27277285/robotium-android-studio

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