text: # Copyright 2015 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 mock
  
  from oslo_messaging.tests import utils as test_utils
  
  
  class TestDeprecationWarning(test_utils.BaseTestCase):
  
      @mock.patch('warnings.warn')
      def test_impl_messaging_deprecation_warning(self, mock_warn):
          # Tests that we get a deprecation warning when loading a messaging
          # driver out of oslo_messaging.notify._impl_messaging.
          from oslo_messaging.notify import _impl_messaging as messaging
          driver = messaging.MessagingV2Driver(
              conf={}, topics=['notifications'], transport='rpc')
          # Make sure we got a deprecation warning by loading from the alias
          self.assertEqual(1, mock_warn.call_count)
  