Runs the test case.
Document doc;
NodeList elementList;
Node testEmployee;
NamedNodeMap attributes;
Attr districtNode;
doc = (Document) load("hc_staff", false);
elementList = doc.getElementsByTagName("acronym");
testEmployee = elementList.item(1);
attributes = testEmployee.getAttributes();
districtNode = (Attr) attributes.getNamedItem("lang");
assertNull("langAttrNull", districtNode);