code: def test_token_preprocessor(self):
      TaskRegistry.remove("cached_task")
      _add_t5_task(
          "cached_task",
          dataset_providers.TfdsTask,
          tfds_name="fake:0.0.0",
          token_preprocessor=(test_utils.test_token_preprocessor,),
      )
  
      self.verify_task_matches_fake_datasets(
          "cached_task", use_cached=False, token_preprocessed=True
      )
      self.verify_task_matches_fake_datasets(
          "cached_task", use_cached=True, token_preprocessed=True
      )
  
imports: import os
  from absl.testing import absltest
  import immutabledict
  import seqio
  from seqio import test_utils
  from t5.data import dataset_providers
  import tensorflow.compat.v2
label_desc: Use image node_id 7 for calling the TasksTest obj's underlying member method code with example usage: obj.test_token_preprocessor() without return types