API test tempest.api.network.admin.test_l3_agent_scheduler.L3AgentSchedulerTestJSON.test_add_list_remove_router_on_l3_agent may fail in some cases in multimode environment.
It will happen when neutron will be configured with l3_ha=False, so by default every created router will be nonHA router. In such case router created in mentioned test will be automatically scheduled to one of available L3 agents and then in test test_add_list_remove_router_on_l3_agent there is another attempt to add this router to some L3 agent.
If is nonHA router and it will be different agent than one on which router is already scheduled, neutron will return Conflict response.
There is no this issue for HA routers as such routers can be scheduled in more than one agent.
The solution to fix that may be to always create HA router.
Fix proposed to branch: master
Review: https:/