code: def test_string_becomes_lowercase(self):
      tagged_text = self.tagger.get_text_index_string(
          "THIS IS HOW IT BEGINS!"
      )
  
      self.assertEqual(tagged_text, "DET:be VERB:how ADV:it NOUN:begin")
  
imports: from unittest import TestCase
  from chatterbot import languages
  from chatterbot import tagging
label_desc: Use image node_id 6 for calling the PosLemmaTaggerTests obj's underlying member method code with example usage: obj.test_string_becomes_lowercase() without return types