code: def test_preprocessing_fn(self):
      self.assertAnalyzeAndTransformResults(
          simple_example._RAW_DATA,
          simple_example._RAW_DATA_METADATA,
          simple_example._preprocessing_fn,
          _EXPECTED_TRANSFORMED_OUTPUT,
      )
  
file_path: transform/examples/simple_example_test.py
imports: import tensorflow
  import simple_example
  from tensorflow_transform.beam import tft_unit
label_desc: Use image node_id 1 for calling the SimpleExampleTest obj's underlying member method code with example usage: obj.test_preprocessing_fn() without return types