code: def test_clean_text(self):
      tokenizer = self.get_tokenizer()
  
      # Example taken from the issue https://github.com/huggingface/tokenizers/issues/340
      self.assertListEqual(
          [tokenizer.tokenize(t) for t in ["Test", "\xad", "test"]],
          [["[UNK]"], [], ["[UNK]"]],
      )
  
      if self.test_rust_tokenizer:
          rust_tokenizer = self.get_rust_tokenizer()
          self.assertListEqual(
              [
                  rust_tokenizer.tokenize(t)
                  for t in ["Test", "\xad", "test"]
              ],
              [["[UNK]"], [], ["[UNK]"]],
          )
  
imports: import os
  import unittest
  from transformers import RealmTokenizerFast
  from transformers.models.bert.tokenization_bert import VOCAB_FILES_NAMES, BasicTokenizer, WordpieceTokenizer, _is_control, _is_punctuation, _is_whitespace
  from transformers.models.realm.tokenization_realm import RealmTokenizer
  from transformers.testing_utils import require_tokenizers, slow
  from ...test_tokenization_common import TokenizerTesterMixin, filter_non_english
label_desc: Use image node_id 18 for calling the RealmTokenizationTest obj's underlying member method code with example usage: obj.test_clean_text() without return types