Currently I struggle to get the android emulator running in combination with gradle connectedAndroidTest 

The tests are working if I start the emulator manually.

Also in the log I see the emulator starts correctly, but I always get 

Execution failed for task ':app:connectedDebugAndroidTest'.
> com.android.builder.testing.api.DeviceException: No connected devices!

After a while of digging around I found out that the reason is that gradle uses the standard port of the adb to check for emulators and not the newly started from the android emulator plugin.

I checked using bash if ANDROID_SERIAL is correctly set (emulator-XXXX) and it is, but it seems connectedAndroidTest doesn't pickup the value and checks for that emulator.

I wonder if anybody has a hint what to check or how other people using this plugin starting the
connectedAndroidTests?