code: def testPreprocessingFn(self):
      tft_unit.skip_if_not_tf2("Tensorflow 2.x required.")
      tfxio = simple_sequence_example._make_tfxio(
          simple_sequence_example._SCHEMA
      )
      self.assertAnalyzeAndTransformResults(
          tfxio.BeamSource(),
          tfxio.TensorAdapterConfig(),
          simple_sequence_example._preprocessing_fn,
          output_record_batches=True,
          expected_data=_EXPECTED_TRANSFORMED_OUTPUT,
      )
  
file_path: transform/examples/simple_sequence_example_test.py
imports: import tensorflow
  import simple_sequence_example
  from tensorflow_transform.beam import tft_unit
label_desc: Use image node_id 1 for calling the SimpleSequenceExampleTest obj's underlying member method code with example usage: obj.testPreprocessingFn() without return types