Download apks from maven:
And install them and start the process like https://developer.android.com/training/testing/junit-runner.html
adb install -r path/to/orchestrator-1.0.0.apk adb install -r path/to/test-services-1.0.0.apk # Replace "com.example.test" with the name of the package containing your tests. adb shell 'CLASSPATH=$(pm path android.support.test.services) app_process / \ android.support.test.services.shellexecutor.ShellMain am instrument -w -e \ targetInstrumentation com.example.test/android.support.test.runner.AndroidJUnitRunner \ android.support.test.orchestrator/.AndroidTestOrchestrator'
If you have a custom runner, you can replace android.support.test.runner.AndroidJUnitRunner to yours.
After the above, you can start instrumentation tests via the orchestration layer.
./gradlew connectedAndroidTest