code: def test_number_of_added_tokens(self):
      tokenizers = self.get_tokenizers(do_lower_case=False)
      for tokenizer in tokenizers:
          with self.subTest(f"{tokenizer.__class__.__name__}"):
              table, query = self.get_table_and_query(tokenizer)
  
              sequences = tokenizer.encode(
                  table, query, add_special_tokens=False
              )
              attached_sequences = tokenizer.encode(
                  table, query, add_special_tokens=True
              )
  
              self.assertEqual(
                  2, len(attached_sequences) - len(sequences)
              )
  
imports: import json
  import os
  import shutil
  import tempfile
  import unittest
  from typing import List
  import pandas
  from transformers import AddedToken, TapexTokenizer
  from transformers.models.tapex.tokenization_tapex import VOCAB_FILES_NAMES
  from transformers.testing_utils import is_pt_tf_cross_test, require_pandas, slow
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 17 for calling the TapexTokenizationTest obj's underlying member method code with example usage: obj.test_number_of_added_tokens() without return types