@Test(timeout = 5000)
public void testPullRMNodeLabelsInfo() throws IOException {

  mgr.addToCluserNodeLabelsWithDefaultExclusivity(toSet("x", "y", "z"));
  mgr.activateNode(NodeId.newInstance("n1", 1), Resource.newInstance(10, 0));
  mgr.activateNode(NodeId.newInstance("n2", 1), Resource.newInstance(10, 0));
  mgr.activateNode(NodeId.newInstance("n3", 1), Resource.newInstance(10, 0));
  mgr.activateNode(NodeId.newInstance("n4", 1), Resource.newInstance(10, 0));
  mgr.activateNode(NodeId.newInstance("n5", 1), Resource.newInstance(10, 0));
  mgr.replaceLabelsOnNode(ImmutableMap.of(toNodeId("n1"), toSet("x"),
      toNodeId("n2"), toSet("x"), toNodeId("n3"), toSet("y")));
  
  // x, y, z and ""
  List<RMNodeLabel> infos = mgr.pullRMNodeLabelsInfo();
  Assert.assertEquals(4, infos.size());
  checkNodeLabelInfo(infos, RMNodeLabelsManager.NO_LABEL, 2, 20);
  checkNodeLabelInfo(infos, "x", 2, 20);
  checkNodeLabelInfo(infos, "y", 1, 10);
  checkNodeLabelInfo(infos, "z", 0, 0);
}