code: def test_dr_vctk_invalid_subset(self):
      subset = "invalid"
      with pytest.raises(
          RuntimeError,
          match=f"The subset '{subset}' does not match any of the supported subsets",
      ):
          dr_vctk.DR_VCTK(self.root_dir, subset=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 7 for calling the TestDRVCTK obj's underlying member method code with example usage: obj.test_dr_vctk_invalid_subset() without return types