old_contents: 
  # Copyright 2014 Red Hat, Inc.
  #
  #    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 pkg_resources
  import testtools
  
  try:
      from oslo.messaging import opts
  except ImportError:
      opts = None
  from tests import utils as test_utils
  
  
  class OptsTestCase(test_utils.BaseTestCase):
  
      @testtools.skipIf(opts is None, "Options not importable")
      def setUp(self):
          super(OptsTestCase, self).setUp()
  
      def _test_list_opts(self, result):
          self.assertEqual(3, len(result))
  
          groups = [g for (g, l) in result]
          self.assertIn(None, groups)
          self.assertIn('matchmaker_ring', groups)
          self.assertIn('matchmaker_redis', groups)
  
          opt_names = [o.name for (g, l) in result for o in l]
          self.assertIn('rpc_backend', opt_names)
  
      def test_list_opts(self):
          self._test_list_opts(opts.list_opts())
  
      def test_entry_point(self):
          result = None
          for ep in pkg_resources.iter_entry_points('oslo.config.opts'):
              if ep.name == "oslo.messaging":
                  list_fn = ep.load()
                  result = list_fn()
                  break
  
          self.assertIsNotNone(result)
          self._test_list_opts(result)
  
new_contents: 
  # Copyright 2014 Red Hat, Inc.
  #
  #    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 stevedore
  import testtools
  
  try:
      from oslo.messaging import opts
  except ImportError:
      opts = None
  from tests import utils as test_utils
  
  
  class OptsTestCase(test_utils.BaseTestCase):
  
      @testtools.skipIf(opts is None, "Options not importable")
      def setUp(self):
          super(OptsTestCase, self).setUp()
  
      def _test_list_opts(self, result):
          self.assertEqual(3, len(result))
  
          groups = [g for (g, l) in result]
          self.assertIn(None, groups)
          self.assertIn('matchmaker_ring', groups)
          self.assertIn('matchmaker_redis', groups)
  
          opt_names = [o.name for (g, l) in result for o in l]
          self.assertIn('rpc_backend', opt_names)
  
      def test_list_opts(self):
          self._test_list_opts(opts.list_opts())
  
      def test_entry_point(self):
          result = None
          for ext in stevedore.ExtensionManager('oslo.config.opts',
                                                invoke_on_load=True):
              if ext.name == "oslo.messaging":
                  result = ext.obj
                  break
  
          self.assertIsNotNone(result)
          self._test_list_opts(result)
  
subject: Fix list_opts test to not check all deps