Runs the test case.
Document doc;
NodeList elementList;
Node employeeNode;
NodeList childList;
Node createdNode;
int expectedLength;
int length;
doc = (Document) load("staff", true);
elementList = doc.getElementsByTagName("employee");
employeeNode = elementList.item(1);
childList = employeeNode.getChildNodes();
expectedLength = (int) childList.getLength();
expectedLength += 1;
createdNode = doc.createElement("text3");
employeeNode = employeeNode.appendChild(createdNode);
length = (int) childList.getLength();
assertEquals("childNodeLength", expectedLength, length);