public void clear_unassigned_actions()
{
var subDevice1 = Substitute.For <IHOTASDevice>();
var subDevice2 = Substitute.For <IHOTASDevice>();
subDevice1.ButtonMap.Returns(new ObservableCollection <IHotasBaseMap>());
var subDeviceFactory = Substitute.For <HOTASDeviceFactory>();
subDeviceFactory.CreateHOTASDevice(Arg.Any <IDirectInput>(), Arg.Any <Guid>(), Arg.Any <Guid>(), Arg.Any <string>(), Arg.Any <IHOTASQueue>()).Returns(subDevice1);
var list = new HOTASCollection(Substitute.For <DirectInputFactory>(), Substitute.For <JoystickFactory>(), Substitute.For <HOTASQueueFactory>(Substitute.For <IKeyboard>()), subDeviceFactory);
list.AddDevice(subDevice1);
subDevice2.ButtonMap.Returns(new ObservableCollection <IHotasBaseMap>());
subDeviceFactory.CreateHOTASDevice(Arg.Any <IDirectInput>(), Arg.Any <Guid>(), Arg.Any <Guid>(), Arg.Any <string>(), Arg.Any <IHOTASQueue>()).Returns(subDevice2);
list.AddDevice(subDevice2);
list.ListenToAllDevices();
list.ClearUnassignedActions();
subDevice1.Received().ClearUnassignedActions();
subDevice2.Received().ClearUnassignedActions();
}