Execute the unload event handler at the end of each startup test

[AlCalzone]

https://travis-ci.org/Apollon77/ioBroker.contactid/jobs/504447879

[Apollon77]

https://travis-ci.org/Apollon77/ioBroker.sia/jobs/504452931

[paveltsytovich]

I have same problem with SerialPort. I create fake serial port with following code
FakeSerialPort.Binding.createPort('/dev/ttyUSB0',{ echo: false, record: true,autoOpen: false });
and moking real serialport :
additionalMockedModules: { 'serialport': FakeSerialPort }

When I run test, I receive message Uncaught Error: Port is locked cannot open because FakeSerialPort in use when I first run, but can`t use again in second run (in compact mode).
I need handler before create my adapter for each time (normal and compact mode). This handler I will use for create fake serial port