[test]The unit test file ovn_l3.test_plugin cannot be run alone

[ZhouHeng]

python3 -m testtools.run neutron.tests.unit.services.ovn_l3.test_plugin.TestOVNL3RouterPlugin.test_schedule_unhosted_gateways
/usr/lib64/python3.6/runpy.py:125: RuntimeWarning: 'testtools.run' found in sys.modules after import of package 'testtools', but prior to execution of 'testtools.run'; this may result in unpredictable behaviour
  warn(RuntimeWarning(msg))
Tests running...
======================================================================
ERROR: neutron.tests.unit.services.ovn_l3.test_plugin.TestOVNL3RouterPlugin.test_schedule_unhosted_gateways
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/neutron/neutron/tests/unit/services/ovn_l3/test_plugin.py", line 61, in setUp
    cfg.CONF.set_override('max_header_size', 38, group='ml2_type_geneve')
  File "/usr/local/lib/python3.6/site-packages/oslo_config/cfg.py", line 2077, in __inner
    result = f(self, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/oslo_config/cfg.py", line 2460, in set_override
    opt_info = self._get_opt_info(name, group)
  File "/usr/local/lib/python3.6/site-packages/oslo_config/cfg.py", line 2869, in _get_opt_info
    group = self._get_group(group)
  File "/usr/local/lib/python3.6/site-packages/oslo_config/cfg.py", line 2838, in _get_group
    raise NoSuchGroupError(group_name)
oslo_config.cfg.NoSuchGroupError: no such group [ml2_type_geneve]

Ran 1 test in 0.074s
FAILED (failures=1)

Should add from neutron.plugins.ml2.drivers import type_geneve

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/825478

[Oleg Bondarev (obondarev)]

This could be run this way:
 "tox -epy39 tests.unit.services.ovn_l3.test_plugin"

Doesn't it work for you?

[ZhouHeng (zhouhenglc)]

[root@e2527900d3c2 neutron]# tox -e py36 neutron.tests.unit.services.ovn_l3.test_plugin.TestOVNL3RouterPlugin.test_schedule_unhosted_gateways
py36 create: /root/neutron/.tox/py36
py36 installdeps: -chttps://releases.openstack.org/constraints/upper/master, -r/root/neutron/requirements.txt, -r/root/neutron/test-requi

run tox, will request "releases.openstack.org", due to the regional network, it is time-consuming. Don't consider supporting testools? the modification is not complicated and has no adverse effect. It seems that other unit test files can be directly used with testtools

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Brian Haley <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/825478
Reason: Fixed with 413044f253b6d434164e8a94dbeccec7b1b79ebe