Runs the test case.
Document doc;
NodeList elementList;
Node nameNode;
CharacterData child;
String childValue;
int childLength;
doc = (Document) load("staff", true);
elementList = doc.getElementsByTagName("name");
nameNode = elementList.item(0);
child = (CharacterData) nameNode.getFirstChild();
child.appendData(", Esquire");
childValue = child.getData();
childLength = childValue.length();
assertEquals("characterdataAppendDataAssert", 24, childLength);