RuAttitudes -- extract_text_opinions_linkages utilizes a different approach which is not covered by common impementation.

[nicolay-r]

From #224

• Switch to BRAT entity.
  

  AREkit/arekit/contrib/source/ruattitudes/text_object.py

  Lines 26 to 30 in e47f4fa

  	def to_entity(self, to_doc_id_func):
  	assert(callable(to_doc_id_func))
  	return Entity(value=self.__value if len(self.__value) > 0 else '[empty]',
  	e_type=self.__type,
  	group_index=self.__syn_group_index)

[nicolay-r]

Now we can move the test code from the other nivts_project to the AREkit