@Test
public void testGetFilledElements() throws Exception {

    final VoiceXmlDocument document = new VoiceXmlDocument();
    final Vxml vxml = document.getVxml();
    final Menu menu = vxml.appendChild(Menu.class);
    menu.appendChild(Noinput.class);
    menu.appendChild(Help.class);
    final Catch catchNode = menu.appendChild(Catch.class);
    catchNode.setEvent("test");
    final ExecutableMenuForm dialog = new ExecutableMenuForm();
    dialog.setNode(menu);
    dialog.setChoiceConverter(new SrgsXmlChoiceConverter());
    final Collection<Filled> elements = dialog.getFilledElements();
    Assert.assertNull(elements);
}