private void checkEntryChangeNotificationControlToString(EntryChangeNotificationControl ecnc) {
   String toString = "EntryChangeNotificationControl(changeType=" + ecnc.getChangeType();
   if (ecnc.getPreviousDN() != null) {
     toString = toString + ",previousDN=\"" + ecnc.getPreviousDN() + "\"";
   }
   if (ecnc.getChangeNumber() > 0) {
     toString = toString + ",changeNumber=" + ecnc.getChangeNumber();
   }
   toString = toString + ")";
   assertEquals(toString, ecnc.toString());
 }