run androidtest without installing apk in android studio

I want to run androidTest without installing the apk which is to be tested. Here are my tries:

  1. I use commandline to run android test.

    gradle clean
    gradle assembleDebugAndroidTest
    adb install -r app/build/outputs/apk/app-debug.apk
    adb shell am instrument -e mytestclass#mytestmethod -w my.test.pkg/android.support.test.runner.AndroidJUnitRunner

It works fine, but I can't bear that I must change mytestclass#mytestmethod everytime and I can't see the test report.

My goal is to test android app using robotium in the blackbox way.

Android         robotium        
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