model.setValue(5);
in.add(model);
model.setValue(6);
in.add(model);
boolean result = tester.runFlow(new CombineStage(in.flow(), out1.flow(), out2.flow()));
assertThat(result, is(true));
List<Ex1> list1 = out1.toList(new Comparator<Ex1>() {
@Override
public int compare(Ex1 o1, Ex1 o2) {