How to use check_new_dns_server method in tempest

Best Python code snippet using tempest_python

test_network_basic_ops.py

Source:test_network_basic_ops.py

...478        self.subnet.update(dns_nameservers=[alt_dns_server])479        # asserts that Neutron DB has updated the nameservers480        self.assertEqual([alt_dns_server], self.subnet.dns_nameservers,481                         "Failed to update subnet's nameservers")482        def check_new_dns_server():483            """Server needs to renew its dhcp lease in order to get the new dns484            definitions from subnet485            NOTE(amuller): we are renewing the lease as part of the retry486            because Neutron updates dnsmasq asynchronously after the487            subnet-update API call returns.488            """489            ssh_client.renew_lease(fixed_ip=floating_ip['fixed_ip_address'])490            if ssh_client.get_dns_servers() != [alt_dns_server]:491                LOG.debug("Failed to update DNS nameservers")492                return False493            return True494        self.assertTrue(test.call_until_true(check_new_dns_server,495                                             renew_timeout,496                                             renew_delay),...

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