public void MapperDoesNotNotifyDettachedObservers()
{
var airspace = Substitute.For <SWT_ATM.IObserver <List <Data> > >();
var format = new TransponderDataFormat();
var mapper = new CoordinateMapper(format);
var simulator = new TrackSimulator(mapper, Substitute.For <ITransponderReceiver>());
mapper.Attach(airspace);
mapper.Deattach(airspace);
var testData = new List <string>();
testData.Add("ATR423;39045;12932;14000;20151006213456789");
simulator.OnDataReceieved(null, new RawTransponderDataEventArgs(testData));
airspace.DidNotReceive().Update(Arg.Any <List <Data> >());
}