docstr: `soundfile_backend.save` can save wav format.
docstr_tok: ["`","soundfile_backend.save","`","can","save","wav","format","."]
code: def assert_wav(self, dtype, sample_rate, num_channels, num_frames):
      """`soundfile_backend.save` can save wav format."""
      path = self.get_temp_path("data.wav")
      expected = get_wav_data(
          dtype, num_channels, num_frames=num_frames, normalize=False
      )
      soundfile_backend.save(path, expected, sample_rate)
      found, sr = load_wav(path, normalize=False)
      assert sample_rate == sr
      self.assertEqual(found, expected)
  
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 1 for calling the SaveTestBase obj's underlying member method code with example usage: obj.assert_wav(dtype, sample_rate, num_channels, num_frames) without return types