protected void runTest() throws Throwable {
OMFactory factory = metaFactory.getOMFactory();
OMElement element = OMXMLBuilderFactory.createOMBuilder(factory, new StringReader(
"<element><!--comment--><a/><!--comment--></element>")).getDocumentElement();
OMNode child = element.getFirstOMChild();
element.discard();
try {
child.getNextOMSibling();
fail("Expected NodeUnavailableException");
} catch (NodeUnavailableException ex) {
// Expected