def METHOD_NAME():
    relayer = Relayer(BaseClass, [Protocol.MRP, Protocol.DMAP, Protocol.AirPlay])
    relayer.register(SubClass1(), Protocol.AirPlay)
    assert relayer.main_protocol == Protocol.AirPlay
    relayer.register(SubClass1(), Protocol.DMAP)
    assert relayer.main_protocol == Protocol.DMAP
    relayer.register(SubClass1(), Protocol.MRP)
    assert relayer.main_protocol == Protocol.MRP