code: def test_voice_conversion(self):
      config = FreeVCConfig()
      model = FreeVC(config).to(device)
      model.eval()
  
      source_wav, target_wav = self._create_inputs_inference()
      output_wav = model.voice_conversion(source_wav, target_wav)
      assert (
          output_wav.shape[0] + config.audio.hop_length
          == source_wav.shape[0]
      ), f"{output_wav.shape} != {source_wav.shape}"
  
imports: import os
  import unittest
  import torch
  from tests import get_tests_input_path
  from TTS.vc.configs.freevc_config import FreeVCConfig
  from TTS.vc.models.freevc import FreeVC
label_desc: Use image node_id 10 for calling the TestFreeVC obj's underlying member method code with example usage: obj.test_voice_conversion() without return types