def add_msg_handler(self, message_number, handler):
        self.__msg_dict[message_number] = handler
Wrapper utility that returns a test metering label rule.
dataset/ETHPy150Open rene-aguirre/pywinusb/pywinusb/hid/wnd_hook_mixin.py/WndProcHookMixin.add_msg_handler--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/tests/tempest/api/base.py/BaseAdminNetworkTest.create_metering_label_rule