Runs the test case.
Document doc;
NodeList elementList;
Node testEmployee;
NamedNodeMap attributes;
Attr districtNode;
doc = (Document) load("staff", false);
elementList = doc.getElementsByTagName("address");
testEmployee = elementList.item(1);
attributes = testEmployee.getAttributes();
districtNode = (Attr) attributes.getNamedItem("district");
assertNull("namednodemapReturnNullAssert", districtNode);