old_contents: # coding: utf8
  
  from matriochkas.core import Configuration
  
  
  def test_stream_class_configuration():
  
      assert len(Configuration.StreamClassConfiguration) == 2
  
      assert Configuration.StreamClassConfiguration.StringIO.name == 'StringIO'
      assert Configuration.StreamClassConfiguration.StringIO.value == {'read_method': 'read', 'write_method': 'write',
                                                                       'return_method': 'getvalue',
                                                                       'close_method': 'close'}
  
      assert Configuration.StreamClassConfiguration.TextIOWrapper.name == 'TextIOWrapper'
      assert Configuration.StreamClassConfiguration.TextIOWrapper.value == {'read_method': 'read',
                                                                            'write_method': 'write',
                                                                            'return_method': 'None',
                                                                            'close_method': 'close'}
  
new_contents: # coding: utf8
  
  from matriochkas.core import Configuration
  
  
  def test_stream_class_configuration():
  
      assert len(Configuration.StreamClassConfiguration) == 2
  
      assert Configuration.StreamClassConfiguration.StringIO.name == 'StringIO'
      assert Configuration.StreamClassConfiguration.StringIO.value == {'read_method': 'read', 'write_method': 'write',
                                                                       'return_method': 'getvalue',
                                                                       'close_method': 'close', 'seek_method': 'seek'}
  
      assert Configuration.StreamClassConfiguration.TextIOWrapper.name == 'TextIOWrapper'
      assert Configuration.StreamClassConfiguration.TextIOWrapper.value == {'read_method': 'read',
                                                                            'write_method': 'write',
                                                                            'return_method': 'None',
                                                                            'close_method': 'close',
                                                                            'seek_method': 'seek'}
  
subject: Modify unit test