I\'m using IntelliJ IDEA 15.0.2 (Community Edition) under Windows 7 and Windows 10 Pro, Gradle 2.9, JDK 1.7.0_65. Operating systems installed as guests under VMware Workstat
To get rid of unit test problems in debug mode, I deleted all test folders in android studio explorer, then I commented three test implementation lines in build.gradle(module) file. Then I changed the combobox in android studio menu (top of the IDE) from "all in app" to "app".
https://i.stack.imgur.com/alPrS.png