Runs the test case.
Document doc;
NodeList elementList;
Node employeeNode;
NodeList childList;
Node childNode;
Node clonedNode;
Node lastChildNode;
doc = (Document) load("staff", true);
elementList = doc.getElementsByTagName("employee");
employeeNode = elementList.item(1);
childList = employeeNode.getChildNodes();
childNode = childList.item(3);
clonedNode = childNode.cloneNode(false);
lastChildNode = clonedNode.getLastChild();
assertNull("noTextNodes", lastChildNode);