code: def test_file_object(self, dtype, lazy_decode, num_channels):
      file_format = "wav"
  
      np_audio = _create_np_audio(num_channels, dtype)
      _, tmp_file = tempfile.mkstemp()
      _write_audio_file(np_audio, tmp_file, file_format)
  
      class GFileWithSeekOnRead(tf.io.gfile.GFile):
          """Wrapper around GFile which is reusable across multiple read() calls.
  
          This is needed because assertFeature reuses the same
          FeatureExpectationItem several times.
          """
  
          def read(self, *args, **kwargs):
              data_read = super(GFileWithSeekOnRead, self).read(
                  *args, **kwargs
              )
              self.seek(0)
              return data_read
  
      with GFileWithSeekOnRead(tmp_file, "rb") as file_obj:
          self.assertFeature(
              feature=features.Audio(
                  file_format=file_format,
                  shape=_shape_for_channels(num_channels),
                  dtype=dtype,
                  lazy_decode=lazy_decode,
              ),
              shape=_shape_for_channels(num_channels),
              dtype=dtype,
              tests=[
                  testing.FeatureExpectationItem(
                      value=file_obj,
                      expected=np_audio,
                  ),
              ],
          )
  
imports: import array
  import pathlib
  import tempfile
  from absl.testing import parameterized
  import numpy
  import pydub
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import features
label_desc: Use image node_id 5 for calling the AudioFeatureTest obj's underlying member method code with example usage: obj.test_file_object(dtype, lazy_decode, num_channels) and returns: data_read