text: # Copyright 2016 IBM Corp.
  #
  # 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.
  
  import time
  
  import nova.scheduler.utils
  import nova.servicegroup
  from nova import test
  from nova.tests import fixtures as nova_fixtures
  from nova.tests.functional.api import client
  from nova.tests.unit import cast_as_call
  import nova.tests.unit.image.fake
  from nova.tests.unit import policy_fixture
  
  
  class TestServerGet(test.TestCase):
      REQUIRES_LOCKING = True
  
      def setUp(self):
          super(TestServerGet, self).setUp()
          self.useFixture(policy_fixture.RealPolicyFixture())
          self.useFixture(nova_fixtures.NeutronFixture(self))
          api_fixture = self.useFixture(nova_fixtures.OSAPIFixture(
              api_version='v2.1'))
  
          # The non-admin API client is fine to stay at 2.1 since it just creates
          # and deletes the server.
          self.api = api_fixture.api
          self.admin_api = api_fixture.admin_api
          # The admin API client needs to be at microversion 2.16 to exhibit the
          # regression.
          self.admin_api.microversion = '2.16'
  
          # the image fake backend needed for image discovery
          nova.tests.unit.image.fake.stub_out_image_service(self)
  
          self.start_service('conductor')
          self.flags(driver='chance_scheduler', group='scheduler')
          self.start_service('scheduler')
          self.compute = self.start_service('compute')
          self.consoleauth = self.start_service('consoleauth')
  
          self.useFixture(cast_as_call.CastAsCall(self))
          self.addCleanup(nova.tests.unit.image.fake.FakeImageService_reset)
  
          self.image_id = self.api.get_images()[0]['id']
          self.flavor_id = self.api.get_flavors()[0]['id']
  
      def test_list_deleted_instances(self):
          """Regression test for bug #1548980.
  
          Before fixing this bug, listing deleted instances returned a 404
          because lazy-loading services from a deleted instance failed. Now
          we should be able to list the deleted instance and the host_state
          attribute should be "".
          """
          server = dict(name='server1',
                        imageRef=self.image_id,
                        flavorRef=self.flavor_id)
          server = self.api.post_server({'server': server})
          self.api.delete_server(server['id'])
          # Wait 30 seconds for it to be gone.
          for x in range(30):
              try:
                  self.api.get_server(server['id'])
                  time.sleep(1)
              except client.OpenStackApiNotFoundException:
                  break
          else:
              self.fail('Timed out waiting to delete server: %s' % server['id'])
          servers = self.admin_api.get_servers(search_opts={'deleted': 1})
          self.assertEqual(1, len(servers))
          self.assertEqual(server['id'], servers[0]['id'])
          # host_status is returned in the 2.16 microversion and since the server
          # is deleted it should be the empty string
          self.assertEqual(0, len(servers[0]['host_status']))
  