old_contents: #!/usr/bin/env
  # Copyright 2014 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 nose.tools import assert_equals
  
  from botocore import exceptions
  
  
  def test_client_error_can_handle_missing_code_or_message():
      response = {'Error': {}}
      expect = 'An error occurred (Unknown) when calling the blackhole operation: Unknown'
      assert_equals(str(exceptions.ClientError(response, 'blackhole')), expect)
  
  def test_client_error_has_operation_name_set():
      response = {'Error': {}}
      exception = exceptions.ClientError(response, 'blackhole')
      assert_equals(exception.operation_name, 'blackhole')
  
new_contents: #!/usr/bin/env
  # Copyright 2014 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 nose.tools import assert_equals
  
  from botocore import exceptions
  
  
  def test_client_error_can_handle_missing_code_or_message():
      response = {'Error': {}}
      expect = 'An error occurred (Unknown) when calling the blackhole operation: Unknown'
      assert_equals(str(exceptions.ClientError(response, 'blackhole')), expect)
  
  def test_client_error_has_operation_name_set():
      response = {'Error': {}}
      exception = exceptions.ClientError(response, 'blackhole')
      assert(hasattr(exception, 'operation_name'))
  
  def test_client_error_set_correct_operation_name():
      response = {'Error': {}}
      exception = exceptions.ClientError(response, 'blackhole')
      assert_equals(exception.operation_name, 'blackhole')
  
subject: Add test to check excplicitly if the attribute is set