code: def test_build(self):
      # check non-empty
      config = pywrap_builder.build_whitespace_tokenizer_config()
      self.assertNotEmpty(config)
      # check space character is whitespace
      character = ord(" ")
      bits = config[character >> 3]
      mask = 1 << (character & 0x7)
      self.assertGreater(bits & mask, 0)
      # check letter is not whitespace
      character = ord("a")
      bits = config[character >> 3]
      mask = 1 << (character & 0x7)
      self.assertEqual(bits & mask, 0)
  
file_path: text/tensorflow_text/core/pybinds/pywrap_whitespace_tokenizer_config_builder_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
  from tensorflow_text.core.pybinds import pywrap_whitespace_tokenizer_config_builder
label_desc: Use image node_id 1 for calling the PywrapFastWordpieceBuilderTest obj's underlying member method code with example usage: obj.test_build() without return types