code: def test_load_corpus_english_categories(self):
      data_files = corpus.list_corpus_files(
          "chatterbot.corpus.english.greetings"
      )
      corpus_data = list(corpus.load_corpus(*data_files))
  
      self.assertEqual(len(corpus_data), 1)
  
      # Test that each conversation gets labeled with the correct category
      for _conversation, categories, _file_path in corpus_data:
          self.assertIn("greetings", categories)
  
imports: import os
  import io
  from unittest import TestCase
  from chatterbot import corpus
label_desc: Use image node_id 4 for calling the CorpusLoadingTestCase obj's underlying member method code with example usage: obj.test_load_corpus_english_categories() without return types