node = processor.selectSingleNode(document1, expr);
assertNull("Must be null", node);
// 3. Test multiple node expression
expr = "/test:root/test:*";
NodeList list = processor.selectNodeList(document1, expr);
assertNotNull("Must select two nodes, but got null", list);
assertEquals("Must select two nodes", 2, list.getLength());
assertEquals("Must select <test:element1/> node", "element1", list.item(0).getLocalName());
assertEquals("Must select <test:element2/> node", "element2", list.item(1).getLocalName());