public void TestSetSubsystem()
{
var registry = new SendableRegistry();
var sendableMock = new Mock <ISendable>();
const string name = "mysendable";
registry.Add(sendableMock.Object, name);
Assert.True(registry.Contains(sendableMock.Object));
Assert.Equal("Ungrouped", registry.GetSubsystem(sendableMock.Object));
const string subsystem = "subsystem";
registry.SetSubsystem(sendableMock.Object, subsystem);
Assert.Equal(subsystem, registry.GetSubsystem(sendableMock.Object));
}