code: def test_is_whitespace(self):
      self.assertTrue(_is_whitespace(" "))
      self.assertTrue(_is_whitespace("\t"))
      self.assertTrue(_is_whitespace("\r"))
      self.assertTrue(_is_whitespace("\n"))
      self.assertTrue(_is_whitespace("\u00A0"))
  
      self.assertFalse(_is_whitespace("A"))
      self.assertFalse(_is_whitespace("-"))
  
imports: import os
  import unittest
  from transformers import BertTokenizerFast
  from transformers.models.bert.tokenization_bert import VOCAB_FILES_NAMES, BasicTokenizer, BertTokenizer, WordpieceTokenizer, _is_control, _is_punctuation, _is_whitespace
  from transformers.testing_utils import require_tokenizers, slow
  from ...test_tokenization_common import TokenizerTesterMixin, filter_non_english
label_desc: Use image node_id 16 for calling the BertTokenizationTest obj's underlying member method code with example usage: obj.test_is_whitespace() without return types