mywin.ack(seqno, sender2);
System.out.println("entry is " + mywin.printDetails(seqno));
assertEquals(3, mywin.getNumberOfResponsesExpected(seqno));
assertEquals(2, mywin.getNumberOfResponsesReceived(seqno));
mywin.waitUntilAllAcksReceived(4000);
mywin.suspect(sender3);
assertEquals(0, mywin.size()); // because suspect() removed that entry
}