docstr: Saving audio via file-like object works
docstr_tok: ["Saving","audio","via","file-like","object","works"]
code: def test_fileobj_nist(self):
      """Saving audio via file-like object works"""
      self._test_fileobj("NIST")
  
imports: import io
  from unittest.mock import patch
  from torchaudio._internal import module_utils
  from torchaudio.backend import soundfile_backend
  from torchaudio_unittest.common_utils import get_wav_data, load_wav, nested_params, PytorchTestCase, skipIfNoModule, TempDirMixin
  from .common import fetch_wav_subtype, parameterize, skipIfFormatNotSupported
label_desc: Use image node_id 4 for calling the TestFileObject obj's underlying member method code with example usage: obj.test_fileobj_nist() without return types