text: # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  from nova import test
  from nova.tests import fixtures as nova_fixtures
  from nova.tests.functional import fixtures as func_fixtures
  from nova.tests.functional import integrated_helpers
  
  
  class ListDeletedServersWithMarker(test.TestCase,
                                     integrated_helpers.InstanceHelperMixin):
      """Regression test for bug 1849409 introduced in Queens where listing
      deleted servers with a marker returns the wrong results because the marker
      is nulled out if BuildRequestList.get_by_filters does not raise
      MarkerNotFound, but that does not mean the marker was found in the build
      request list.
      """
      def setUp(self):
          super(ListDeletedServersWithMarker, self).setUp()
          # Start standard fixtures.
          self.useFixture(func_fixtures.PlacementFixture())
          self.useFixture(nova_fixtures.NeutronFixture(self))
          self.useFixture(nova_fixtures.GlanceFixture(self))
  
          # Start nova services.
          self.api = self.useFixture(nova_fixtures.OSAPIFixture(
              api_version='v2.1')).admin_api
          self.start_service('conductor')
          self.start_service('scheduler')
          self.start_service('compute')
  
      def test_list_deleted_servers_with_marker(self):
          # Create a server.
          server = self._build_server()
          server = self.api.post_server({'server': server})
          server = self._wait_for_state_change(server, 'ACTIVE')
          # Now delete the server and wait for it to be gone.
          self._delete_server(server)
          # List deleted servers, we should get the one back.
          servers = self.api.get_servers(detail=False,
                                         search_opts={'deleted': True})
          self.assertEqual(1, len(servers), servers)
          self.assertEqual(server['id'], servers[0]['id'])
          # Now list deleted servers with a marker which should not return the
          # marker instance.
          servers = self.api.get_servers(detail=False,
                                         search_opts={'deleted': True,
                                                      'marker': server['id']})
          self.assertEqual(0, len(servers), servers)
  