Runs the test case.
Document doc;
Node entRef;
Node createdNode;
Node insertedNode;
Node refChild = null;
doc = (Document) load("staff", true);
entRef = doc.createEntityReference("ent4");
assertNotNull("createdEntRefNotNull", entRef);
createdNode = doc.createElement("text3");
{
boolean success = false;
try {
insertedNode = entRef.insertBefore(createdNode, refChild);
} catch (DOMException ex) {
success = (ex.code == DOMException.NO_MODIFICATION_ALLOWED_ERR);
}
assertTrue("throw_NO_MODIFICATION_ALLOWED_ERR", success);
}