code: def test_wav(self):
      dtype = "float32"
      sample_rate = 16000
      num_channels = 2
      self.run_smoke_test("wav", sample_rate, num_channels, dtype=dtype)
  
file_path: audio/test/torchaudio_unittest/backend/dispatcher/smoke_test.py
imports: import io
  from torchaudio._backend.utils import get_info_func, get_load_func, get_save_func
  from torchaudio_unittest.common_utils import get_wav_data, PytorchTestCase, skipIfNoFFmpeg, TempDirMixin
label_desc: Use image node_id 2 for calling the SmokeTest obj's underlying member method code with example usage: obj.test_wav() without return types