boolean result = tester.runFlow(new FlowDescription() {
@Override
protected void describe() {
CoreOperatorFactory c = new CoreOperatorFactory();
ExOperatorFactory f = new ExOperatorFactory();
Update u1 = f.update(pIn1, 1);
Update u2 = f.update(pIn1, 2);
CogroupAdd c1 = f.cogroupAdd(c.confluent(u1.out, u2.out));
CogroupAdd c2 = f.cogroupAdd(c.confluent(u1.out, u2.out));
pOut1.add(c1.result);
pOut2.add(c2.result);