Runs the test case.
Document doc;
EntityReference entRef;
CharacterData entText;
doc = (Document) load("staff", true);
entRef = doc.createEntityReference("ent3");
assertNotNull("createdEntRefNotNull", entRef);
entText = (CharacterData) entRef.getFirstChild();
assertNotNull("entTextNotNull", entText);
{
boolean success = false;
try {
entText.setNodeValue("newValue");
} catch (DOMException ex) {
success = (ex.code == DOMException.NO_MODIFICATION_ALLOWED_ERR);
}
assertTrue("throw_NO_MODIFICATION_ALLOWED_ERR", success);
}