new_contents: # Copyright 2020 Amazon.com, Inc. or its affiliates. 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. A copy of
  # the License is located at
  #
  # http://aws.amazon.com/apache2.0/
  #
  # or in the "license" file accompanying this file. This file 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 botocore.session import Session
  from nose.tools import assert_false
  
  
  def _all_services():
      session = Session()
      service_names = session.get_available_services()
      for service_name in service_names:
          yield session.get_service_model(service_name)
  
  
  def _all_operations():
      for service_model in _all_services():
          for operation_name in service_model.operation_names:
              yield service_model.operation_model(operation_name)
  
  
  def _assert_not_shadowed(key, shape):
      if not shape:
          return
      msg = (
          'Found shape "%s" that shadows the botocore response key "%s"'
      )
      assert_false(key in shape.members, msg % (shape.name, key))
  
  
  def test_response_metadata_is_not_shadowed():
      for operation_model in _all_operations():
          shape = operation_model.output_shape
          yield _assert_not_shadowed, 'ResponseMetadata', shape
  
  
  def test_exceptions_do_not_shadow():
      for service_model in _all_services():
          for shape in service_model.error_shapes:
              yield _assert_not_shadowed, 'ResponseMetadata', shape
              yield _assert_not_shadowed, 'Error', shape
  
subject: Add functional test to ensure response keys are not shadowed