code: def test_vocab_size(self):
      # Bytes + pad + subwords
      self.assertEqual(
          (256 + 1 + len(self.vocab_list)), self.encoder.vocab_size
      )
  
imports: from __future__ import unicode_literals
  import os
  from absl.testing import parameterized
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import utils
  from tensorflow_datasets.core.deprecated.text import subword_text_encoder
  from tensorflow_datasets.core.deprecated.text import text_encoder
label_desc: Use image node_id 2 for calling the SubwordTextEncoderTest obj's underlying member method code with example usage: obj.test_vocab_size() without return types