code: def test_do_lower_case(self):
      tokenizer = AutoTokenizer.from_pretrained(
          "distilbert-base-uncased", do_lower_case=False
      )
      sample = "Hello, world. How are you?"
      tokens = tokenizer.tokenize(sample)
      self.assertEqual("[UNK]", tokens[0])
  
      tokenizer = AutoTokenizer.from_pretrained(
          "microsoft/mpnet-base", do_lower_case=False
      )
      tokens = tokenizer.tokenize(sample)
      self.assertEqual("[UNK]", tokens[0])
  
imports: import os
  import shutil
  import sys
  import tempfile
  import unittest
  from pathlib import Path
  import pytest
  from transformers import BERT_PRETRAINED_CONFIG_ARCHIVE_MAP, GPT2_PRETRAINED_CONFIG_ARCHIVE_MAP, AutoTokenizer, BertConfig, BertTokenizer, BertTokenizerFast, CTRLTokenizer, GPT2Tokenizer, GPT2TokenizerFast, PreTrainedTokenizerFast, RobertaTokenizer, RobertaTokenizerFast, is_tokenizers_available
  from transformers.models.auto.configuration_auto import CONFIG_MAPPING, AutoConfig
  from transformers.models.auto.tokenization_auto import TOKENIZER_MAPPING, get_tokenizer_config, tokenizer_class_from_name
  from transformers.models.roberta.configuration_roberta import RobertaConfig
  from transformers.testing_utils import DUMMY_DIFF_TOKENIZER_IDENTIFIER, DUMMY_UNKNOWN_IDENTIFIER, SMALL_MODEL_IDENTIFIER, RequestCounter, require_tokenizers, slow
  from test_module.custom_configuration import CustomConfig
  from test_module.custom_tokenization import CustomTokenizer
label_desc: Use image node_id 12 for calling the AutoTokenizerTest obj's underlying member method code with example usage: obj.test_do_lower_case() without return types