old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2011 Rackspace
  # All Rights Reserved.
  #
  # 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 flags
  from nova import log as logging
  from nova.tests.network import base
  
  
  FLAGS = flags.FLAGS
  LOG = logging.getLogger('nova.tests.network')
  
  
  class FlatNetworkTestCase(base.NetworkTestCase, base.TestFuncs):
      network_manager = 'nova.network.manager.FlatManager'
  
      def setUp(self):
          super(FlatNetworkTestCase, self).setUp()
  
      
  
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2011 Rackspace
  # All Rights Reserved.
  #
  # 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 flags
  from nova import log as logging
  from nova.tests.network import base
  
  
  FLAGS = flags.FLAGS
  LOG = logging.getLogger('nova.tests.network')
  
  
  #class FlatNetworkTestCase(base.NetworkTestCase, base.TestFuncs):
  #    network_manager = 'nova.network.manager.FlatManager'
  
  #    def setUp(self):
  #        super(FlatNetworkTestCase, self).setUp()
  
  
subject: make it pass for the demo