def METHOD_NAME(self):
    self.link.set_modes("cbt")
    self.link.save()
    self.assertEqual(self.__check_mode(), "cbt")
    self.link.drop_mode("t")
    self.link.save()
    self.assertEqual(self.__check_mode(), "cb")
    mode = self.modes.get("b")
    self.link.drop_mode(mode)
    self.link.save()
    self.assertEqual(self.__check_mode(), "c")