public void RemoveObserverInternal()
{
// call OnStartServer so that observers dict is created
identity.StartServer();
// add an observer connection
INetworkConnection connection = Substitute.For <INetworkConnection>();
identity.observers.Add(connection);
INetworkConnection connection2 = Substitute.For <INetworkConnection>();
// RemoveObserverInternal with invalid connection should do nothing
identity.RemoveObserverInternal(connection2);
Assert.That(identity.observers, Is.EquivalentTo(new[] { connection }));
// RemoveObserverInternal with existing connection should remove it
identity.RemoveObserverInternal(connection);
Assert.That(identity.observers, Is.Empty);
}