}
@Test(description = "Test that calling method of empty listener does nothing. No null pointers for example")
public void emptyWorks() {
l = new CombinedPacketListener();
l.packetLeftComponent(1, 1, 1);
l.packetDroppedByComponent(1, 1);
l.packetArrivedAtComponent(1, 1);
l.packetCreatedByComponent(1, 1);
}