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  #    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 heat.common import exception as heat_exc
  from heat.openstack.common.rpc import common as rpc_common
  from heat.tests.common import HeatTestCase
  from oslo.config import cfg
  
  import heat.api.middleware.fault as fault
  
  
  class FaultMiddlewareTest(HeatTestCase):
  
      def test_openstack_exception_with_kwargs(self):
          wrapper = fault.FaultWrapper(None)
          msg = wrapper._error(heat_exc.StackNotFound(stack_name='a'))
          expected = {'code': 404,
                      'error': {'message': 'The Stack (a) could not be found.',
                                'traceback': 'None\n',
                                'type': 'StackNotFound'},
                      'explanation': 'The resource could not be found.',
                      'title': 'Not Found'}
          self.assertEqual(msg, expected)
  
      def test_openstack_exception_without_kwargs(self):
          wrapper = fault.FaultWrapper(None)
          msg = wrapper._error(heat_exc.NoServiceEndpoint())
          expected = {'code': 500,
                      'error': {'message': 'Response from Keystone does '
                                           'not contain a Heat endpoint.',
                                'traceback': 'None\n',
                                'type': 'NoServiceEndpoint'},
                      'explanation': 'The server has either erred or is '
                                     'incapable of performing the requested '
                                     'operation.',
                      'title': 'Internal Server Error'}
          self.assertEqual(msg, expected)
  
      def test_remote_exception(self):
          error = heat_exc.StackNotFound(stack_name='a')
          exc_info = (type(error), error, None)
          serialized = rpc_common.serialize_remote_exception(exc_info)
          remote_error = rpc_common.deserialize_remote_exception(cfg.CONF,
                                                                 serialized)
          wrapper = fault.FaultWrapper(None)
          msg = wrapper._error(remote_error)
          expected_message, expected_traceback = str(remote_error).split('\n', 1)
          expected = {'code': 404,
                      'error': {'message': expected_message,
                                'traceback': expected_traceback,
                                'type': 'StackNotFound'},
                      'explanation': 'The resource could not be found.',
                      'title': 'Not Found'}
          self.assertEqual(msg, expected)
  
subject: Add unittests for faultwrap middleware