old_contents: #    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 openstackclient.tests.functional import base
  
  
  class AvailabilityZoneTests(base.TestCase):
      """Functional tests for availability zone. """
      HEADERS = ["'Zone Name'"]
      # So far, all components have the same default availability zone name.
      DEFAULT_AZ_NAME = 'nova'
  
      def test_availability_zone_list(self):
          opts = self.get_opts(self.HEADERS)
          raw_output = self.openstack('availability zone list' + opts)
          self.assertIn(self.DEFAULT_AZ_NAME, raw_output)
  
new_contents: #    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 json
  
  from openstackclient.tests.functional import base
  
  
  class AvailabilityZoneTests(base.TestCase):
      """Functional tests for availability zone. """
  
      def test_availability_zone_list(self):
          cmd_output = json.loads(self.openstack(
              'availability zone list -f json'))
          zones = [x['Zone Name'] for x in cmd_output]
          self.assertIn(
              'internal',
              zones
          )
          self.assertIn(
              'nova',
              zones
          )
  
subject: Refactor availability zone functional test