MulticastTree extends NetworkElement { public boolean isDown () { return layer.cache_multicastTreesDown.contains(this); } MulticastTree(NetPlan netPlan , long id , int index,  MulticastDemand demand , Set<Link> links , AttributeMap attributes); Set<Link> getInitialLinkSet(); void revertToInitialSetOfLinks(); boolean isUpTheInitialLinkSet(); NetworkLayer getLayer(); Set<SharedRiskGroup> getSRGs(); MulticastDemand getMulticastDemand(); Node getIngressNode(); Set<Node> getEgressNodesReached(); boolean isReachedEgressNode(Node n); boolean isReachinAllDemandEgressNodes(); List<Link> getSeqLinksToEgressNode(Node egressNode); void setLinks(Set<Link> newLinkSet); Set<Link> getLinkSet(); boolean isDown(); boolean isTraversingZeroCapLinks(); Set<Node> getNodeSet(); Link getIngressLinkOfNode(Node n); Set<Link> getOutputLinkOfNode(Node n); double getTreeTotalLengthInKm(); double getTreeMaximumPathLengthInKm(); double getTreeAveragePathLengthInKm(); double getTreeMaximumPropagationDelayInMs(); double getTreeAveragePropagationDelayInMs(); int getTreeMaximumPathLengthInHops(); double getTreeAveragePathLengthInHops(); int getTreeNumberOfLinks(); double getCarriedTraffic(); double getOccupiedLinkCapacity(); double getCarriedTrafficInNoFailureState(); double getOccupiedLinkCapacityInNoFailureState(); void setCarriedTraffic(double newCarriedTraffic , double newOccupiedLinkCapacity); void remove(); @Override String toString();  }
@Test public void testIsDown() { assertTrue (!t123.isDown()); assertTrue (!tStar.isDown()); link12.setFailureState(false); assertTrue (t123.isDown()); assertTrue (tStar.isDown()); link12.setFailureState(true); assertTrue (!t123.isDown()); assertTrue (!tStar.isDown()); link23.setFailureState(false); assertTrue (t123.isDown()); assertTrue (!tStar.isDown()); link23.setFailureState(true); assertTrue (!t123.isDown()); assertTrue (!tStar.isDown()); }