Runs the test case.
Document doc;
DocumentType docType;
NamedNodeMap entityList;
Entity entityNode;
String entityName;
doc = (Document) load("staff", false);
docType = doc.getDoctype();
assertNotNull("docTypeNotNull", docType);
entityList = docType.getEntities();
assertNotNull("entitiesNotNull", entityList);
entityNode = (Entity) entityList.getNamedItem("ent1");
entityName = entityNode.getNodeName();
assertEquals("entityGetEntityNameAssert", "ent1", entityName);