@Test
public void testNoElements() throws ExecuteException, NotFoundException {

  List<String> params = new ArrayList<>();
  params.add("echo");
  params.add(TEXT);
  try {
    executor.doProcess(params, (MediaPackageElement) null, null, null);
    Assert.fail("The input element should never be null");
  } catch (NullPointerException e) {
    // This exception is expected
  }
}