class_docstr: Tests the SmilesTokenizer to load the USPTO vocab file and a ChemBERTa Masked LM model with pre-trained weights..
code: def test_tokenize(self):
      current_dir = os.path.dirname(os.path.realpath(__file__))
      vocab_path = os.path.join(current_dir, "data", "vocab.txt")
      tokenized_smiles = [
          12,
          16,
          16,
          16,
          17,
          16,
          16,
          18,
          16,
          19,
          16,
          17,
          22,
          19,
          18,
          33,
          17,
          16,
          18,
          23,
          181,
          17,
          22,
          19,
          18,
          17,
          19,
          16,
          33,
          20,
          19,
          55,
          17,
          16,
          38,
          23,
          18,
          17,
          33,
          17,
          19,
          18,
          35,
          20,
          19,
          18,
          16,
          20,
          22,
          16,
          16,
          22,
          16,
          21,
          23,
          20,
          23,
          22,
          16,
          23,
          22,
          16,
          21,
          23,
          18,
          19,
          16,
          20,
          22,
          16,
          16,
          22,
          16,
          16,
          22,
          16,
          20,
          13,
      ]
  
      model = RobertaForMaskedLM.from_pretrained(
          "seyonec/SMILES_tokenized_PubChem_shard00_50k"
      )
      model.num_parameters()
  
      tokenizer = SmilesTokenizer(
          vocab_path, max_len=model.config.max_position_embeddings
      )
  
      assert tokenized_smiles == tokenizer.encode(
          "CCC(CC)COC(=O)[C@H](C)N[P@](=O)(OC[C@H]1O[C@](C#N)([C@H](O)[C@@H]1O)C1=CC=C2N1N=CN=C2N)OC1=CC=CC=C1"
      )
  
imports: import os
  import unittest
  from unittest import TestCase
  import pytest
label_desc: Use image node_id 1 for calling the TestSmilesTokenizer obj's underlying member method code with example usage: obj.test_tokenize() without return types