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[OpenStack Infra <2056778@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/912475
Committed: https://opendev.org/openstack/neutron/commit/2a196fefd4a8a0c15176fe87d88b05d1690ab5fa
Submitter: "Zuul (22348)"
Branch:    master

commit 2a196fefd4a8a0c15176fe87d88b05d1690ab5fa
Author: Arnau Verdaguer <averdagu@xxxxxxxxxx>
Date:   Mon Mar 11 17:30:11 2024 +0100

    Fix TestOVNMechanismDriver ipv6 tests
    
    - test_update_subnet_dhcp_options_in_ovn_ipv6_not_change
    - test_enable_subnet_dhcp_options_in_ovn_ipv6
    This tests will fail if host where unit tests has ipv6 dns_servers
    configured. This patch mocks get_system_dns_servers to avoid tests
    to look at the host configuration.
    
    Closes-Bug: #2056778
    Change-Id: I2e703ab4b63c90d7a14f0dc41d37b0a98163bce0


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2056778

Title:
  TestOVNMechanismDriver some ipv6 tests fails if host has ipv6
  dns_names configured

Status in neutron:
  Fix Released

Bug description:
  If host where tests are executed has ipv6 dns_servers configured on /etc/resolv.conf two test fails.
  The tests are:
  - neutron.tests.unit.plugins.ml2.drivers.ovn.mech_driver.test_mech_driver.TestOVNMechanismDriver.test_update_subnet_dhcp_options_in_ovn_ipv6_not_change
  - neutron.tests.unit.plugins.ml2.drivers.ovn.mech_driver.test_mech_driver.TestOVNMechanismDriver.test_enable_subnet_dhcp_options_in_ovn_ipv6

  This is due to not patching the ovn_utils.get_system_dns_resolvers which ends up looking at host for dns_servers.
  This doesn't happen on ipv4 since on the setup the ipv4 dns_servers are set using ovn_conf.cfg.CONF.set_override.

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