code: def test_info(self, available_backends, expected_backend):
      filename = "test.wav"
      format = "wav"
      with patch(
          "torchaudio._backend.utils.get_available_backends",
          return_value=available_backends,
      ), patch(
          f"torchaudio._backend.utils.{expected_backend.__name__}.info"
      ) as mock_info:
          get_info_func()(filename, format=format)
          mock_info.assert_called_once_with(filename, format, 4096)
  
file_path: audio/test/torchaudio_unittest/backend/dispatcher/dispatcher_test.py
imports: import io
  from unittest.mock import patch
  import torch
  from parameterized import parameterized
  from torchaudio._backend.utils import FFmpegBackend, get_info_func, get_load_func, get_save_func, SoundfileBackend, SoXBackend
  from torchaudio_unittest.common_utils import PytorchTestCase
label_desc: Use image node_id 1 for calling the DispatcherTest obj's underlying member method code with example usage: obj.test_info(available_backends, expected_backend) without return types