old_contents: # Can be used in the test data like ${MyObject()} or ${MyObject(1)}
  class MyObject:
      def __init__(self, index=''):
          self.index = index
      def __str__(self):
          return '<MyObject%s>' % self.index
  
  UNICODE = (u'Hyv\u00E4\u00E4 y\u00F6t\u00E4. '
             u'\u0421\u043F\u0430\u0441\u0438\u0431\u043E!')
  LIST_WITH_OBJECTS = [MyObject(1), MyObject(2)]
  NESTED_LIST = [ [True, False], [[1, None, MyObject(), {}]] ]
  NESTED_TUPLE = ( (True, False), [(1, None, MyObject(), {})] )
  DICT_WITH_OBJECTS = {'As value': MyObject(1), MyObject(2): 'As key'}
  NESTED_DICT = { 1: {None: False},
                  2: {'A': {'n': None},
                      'B': {'o': MyObject(), 'e': {}}} }
  
new_contents: class MyObject:
  
      def __init__(self, index=0):
          self.index = index
  
      def __str__(self):
          return '<MyObject%s>' % (self.index or '')
  
  
  UNICODE = (u'Hyv\u00E4\u00E4 y\u00F6t\u00E4. '
             u'\u0421\u043F\u0430\u0441\u0438\u0431\u043E!')
  LIST_WITH_OBJECTS = [MyObject(1), MyObject(2)]
  NESTED_LIST = [[True, False], [[1, None, MyObject(), {}]]]
  NESTED_TUPLE = ((True, False), [(1, None, MyObject(), {})])
  DICT_WITH_OBJECTS = {'As value': MyObject(1), MyObject(2): 'As key'}
  NESTED_DICT = {1: {None: False},
                 2: {'A': {'n': None},
                     'B': {'o': MyObject(), 'e': {}}}}
  
subject: test data cleanup