public AccumulatingAlignedProcessingTimeWindowOperatorTest() {
   ClosureCleaner.clean(identitySelector, false);
   ClosureCleaner.clean(validatingIdentityFunction, false);
 }
 public AggregatingAlignedProcessingTimeWindowOperatorTest() {
   ClosureCleaner.clean(fieldOneSelector, false);
   ClosureCleaner.clean(sumFunction, false);
 }