code: def test_dr_vctk_test_str(self):
      subset = "test"
      dataset = dr_vctk.DR_VCTK(self.root_dir, subset=subset)
      self._test_dr_vctk(dataset, subset)
  
file_path: audio/test/torchaudio_unittest/datasets/dr_vctk_test.py
imports: from pathlib import Path
  import pytest
  from torchaudio.datasets import dr_vctk
  from torchaudio_unittest.common_utils import get_whitenoise, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 4 for calling the TestDRVCTK obj's underlying member method code with example usage: obj.test_dr_vctk_test_str() without return types