code: private DeleteVolumeResponseType deleteVolume(final String volumeId) {
          DeleteVolumeResponseType ret = new DeleteVolumeResponseType();
          ret.setRequestId(UUID.randomUUID().toString());
          mockVolumeController.deleteVolume(volumeId);
          return ret;
      }
docs: Handles "deleteVolume" request to delete volume and returns response with a volume.
  @param volumeId Volume Id.
  @return a DeleteVolumeResponseType with volume.