@Test
public void testCreateDtmfGrammarNoDtmf() throws Exception  {

    final VoiceXmlDocument document = new VoiceXmlDocument();
    final Vxml vxml = document.getVxml();
    final Form form = vxml.appendChild(Form.class);
    final Field field = form.appendChild(Field.class);
    final Option option1 = field.appendChild(Option.class);
    option1.addText("one");
    final Option option2 = field.appendChild(Option.class);
    option2.addText("two");
    final Option option3 = field.appendChild(Option.class);
    option3.addText("three");
    final Collection<Option> options = field.getChildNodes(Option.class);
    final OptionConverter converter = new SrgsXmlOptionConverter();
    final Grammar grammar = converter.createDtmfGrammar(options);
    Assert.assertNull(grammar);
}