code: def test_function_task(self):
      _add_t5_task(
          "t5_fn_task",
          dataset_providers.FunctionTask,
          splits=("train", "validation"),
          dataset_fn=test_utils.get_fake_dataset,
      )
      self.verify_task_matches_fake_datasets(
          "t5_fn_task", use_cached=False
      )
  
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 3 for calling the TasksTest obj's underlying member method code with example usage: obj.test_function_task() without return types