code: def test_token_to_word(self, encodings):
      single, pair = encodings
  
      assert single.token_to_word(0) == None
      assert single.token_to_word(1) == 0
      assert single.token_to_word(4) == 2
      assert pair.token_to_word(1) == 0
      assert pair.token_to_word(4) == 2
      assert pair.token_to_word(5) == None
      assert pair.token_to_word(6) == 0
      assert pair.token_to_word(7) == 1
  
file_path: hf-tokenizers/bindings/python/tests/bindings/test_encoding.py
imports: import pytest
  from tokenizers import BertWordPieceTokenizer
  from ..utils import bert_files, data_dir
label_desc: Use image node_id 8 for calling the TestEncoding obj's underlying member method code with example usage: obj.test_token_to_word(encodings) without return types