docstr: Test if the unique and sorted option works
docstr_tok: ["Test","if","the","unique","and","sorted","option","works"]
code: def test_unique_sorted(self):
      """Test if the unique and sorted option works"""
      self.characters_empty.characters = "cba"
      self.characters_empty.punctuations = ".,;:!? "
      self.characters_empty.pad = "[PAD]"
      self.characters_empty.eos = "[EOS]"
      self.characters_empty.bos = "[BOS]"
      self.characters_empty.blank = "[BLANK]"
  
      self.assertEqual(
          self.characters_empty.num_chars,
          len(
              [
                  "[PAD]",
                  "[EOS]",
                  "[BOS]",
                  "[BLANK]",
                  "a",
                  "b",
                  "c",
                  ".",
                  ",",
                  ";",
                  ":",
                  "!",
                  "?",
                  " ",
              ]
          ),
      )
  
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 4 for calling the BaseCharacterTest obj's underlying member method code with example usage: obj.test_unique_sorted() without return types