def testImplicitRemoval(self):
r1 = RIPRouter()
r1.name = "r1"
r2 = RIPRouter()
r2.name = "r2"
r3 = RIPRouter()
r3.name = "r3"
r4 = RIPRouter()
r4.name = "r4"
r5 = RIPRouter()
r5.name = "r5"
r6 = RIPRouter()
r6.name = "r6"
r1.neighbor_ports = {r2:2,r3:3}
r1.distance_vector.dest_via_nbors = {r2:{None:0},r3:{None:0},r4:{r2:1,r3:1},r5:{r2:3},r6:{r2:5}}
packet = RoutingUpdate()
packet.src = r2
packet.paths = {r1:1,r4:1}
r1.handle_rx(packet, 2)
self.failUnless(r1.distance_vector.dest_via_nbors == {r2:{None:0},r3:{None:0},r4:{r3:1,r2:1}})
