code: def setUp(self):
      self.characters_empty = BaseCharacters(
          "",
          "",
          pad="",
          eos="",
          bos="",
          blank="",
          is_unique=True,
          is_sorted=True,
      )
  
file_path: TTS/tests/text_tests/test_characters.py
imports: import unittest
  from TTS.tts.utils.text.characters import BaseCharacters, BaseVocabulary, Graphemes, IPAPhonemes
label_desc: Use image node_id 1 for calling the BaseCharacterTest obj's underlying member method code with example usage: obj.setUp() without return types