Droidium has to fail when there is already started emulator on the same ports

Given:

Already started emulator on some console and adb port.

When:

I specify in arquillian.xml that I want to start emulator on such port which matches the one which is used by already started emulator.

Then:

Droidium fails to start it and provides a reason why.

Use case:

I have already started emulator and I want to start another one and with explicitly specified ports from configuration. These ports are already used by the first emulator. Droidium has to fail. There has to be some free port checking utility.