ConcurrentMap<NodeId, RMNode> map = new ConcurrentHashMap<NodeId, RMNode>();
RMNode node = MockNodes.newNodeInfo(1, MockNodes.newResource(4 * 1024));
map.put(node.getNodeID(), node);
when(rmc.getRMNodes()).thenReturn(map);
RMNMInfo rmInfo = new RMNMInfo(rmc,rms);
String liveNMs = rmInfo.getLiveNodeManagers();
ObjectMapper mapper = new ObjectMapper();
JsonNode jn = mapper.readTree(liveNMs);
Assert.assertEquals("Unexpected number of live nodes:",
1, jn.size());
Iterator<JsonNode> it = jn.iterator();