def _GetDecrypter(self):
    try:
      credentials = resolver.Resolver.key_chain.GetCredentials(self._path_spec)
      return encryption_manager.EncryptionManager.GetDecrypter(
          self._encryption_method, **credentials)
    except ValueError as exception:
      raise IOError(exception)
Tests if after creation of new model instance new 
dataset/ETHPy150Open log2timeline/dfvfs/dfvfs/file_io/encrypted_stream_io.py/EncryptedStream._GetDecrypter--crossover with--dataset/ETHPy150Open dominno/django-moderation/tests/tests/unit/testregister.py/RegistrationTestCase.test_register