/** @return */
 public MainTestDataGenerator addLabels() {
   o = Gen.generateLabelNameList("url", cOUNT_OF_THE_LABELS);
   return this;
 }
 /** @return */
 public MainTestDataGenerator addWorkers() {
   w = Gen.generateLabelNameList("worker", cOUNT_OF_THE_WORKERS);
   if (o.length > 1 && w.length > 1) input.addWorkers(w, o.length);
   else return null;
   return this;
 }