code: def test_load_corpus_russian(self):
      data_files = corpus.list_corpus_files("chatterbot.corpus.russian")
      corpus_data = corpus.load_corpus(*data_files)
  
      self.assertTrue(len(list(corpus_data)))
  
imports: import os
  import io
  from unittest import TestCase
  from chatterbot import corpus
label_desc: Use image node_id 12 for calling the CorpusLoadingTestCase obj's underlying member method code with example usage: obj.test_load_corpus_russian() without return types