Last I checked (October) I could not get the build.gradle to play nicely. Most of the other material online involved using instrumentCompile to trick Android Studio into running your unit tests and a custom runner/plugin: https://github.com/JakeWharton/gradle-android-test-plugin
If you have gotten it working in Android Studio, I'd be very keen to see how (if you are willing to share).
If you have gotten it working in Android Studio, I'd be very keen to see how (if you are willing to share).