old_contents: # coding: utf8
  
  from core import ModificationEntities
  
  
  def test_modification_side():
  
      assert len(ModificationEntities.ModificationSide) == 2
  
      assert ModificationEntities.ModificationSide.LEFT.name == 'LEFT'
      assert ModificationEntities.ModificationSide.LEFT.value == -1
  
      assert ModificationEntities.ModificationSide.RIGHT.name == 'RIGHT'
      assert ModificationEntities.ModificationSide.RIGHT.value == 1
  
new_contents: # coding: utf8
  
  from core import ModificationEntities
  
  
  ########################################################################################################################
  
  
  class InstanceModificationEntity(ModificationEntities.ModificationEntity):
      def generate_parsing_result(self, initial_parsing_result):
          return True
  
  ########################################################################################################################
  
  
  def test_modification_side():
  
      assert len(ModificationEntities.ModificationSide) == 2
  
      assert ModificationEntities.ModificationSide.LEFT.name == 'LEFT'
      assert ModificationEntities.ModificationSide.LEFT.value == -1
  
      assert ModificationEntities.ModificationSide.RIGHT.name == 'RIGHT'
      assert ModificationEntities.ModificationSide.RIGHT.value == 1
  
subject: Add InstanceModificationEntity class