def METHOD_NAME(self):
    """Test if the unique option works"""
    self.characters_empty.characters = "abcc"
    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", ".", ",", ";", ":", "!", "?", " "]),
    )