@abc.abstractmethod
    def get_router_availability_zones(self, router):
Routing for two resources works.
dataset/ETHPy150Open openstack/neutron/neutron/extensions/router_availability_zone.py/RouterAvailabilityZonePluginBase.get_router_availability_zones--crossover with--dataset/ETHPy150Open pneff/wsgiservice/tests/test_router.py/test_two_resources