@Test
public void testUpdateClusterConfig() {

  HelixUtils.updateClusterConfig(_helixZkManager, Constants.AUTO_BALANCING, Constants.DISABLE);
  HelixConfigScope scope = HelixUtils.newClusterConfigScope(_helixZkManager);
  Map<String, String> config = _helixZkManager.getClusterManagmentTool()
      .getConfig(scope, Arrays.asList(Constants.AUTO_BALANCING));
  Assert.assertTrue(config != null);
  Assert.assertTrue(config.containsKey(Constants.AUTO_BALANCING));
  Assert.assertTrue(config.get(Constants.AUTO_BALANCING).equalsIgnoreCase(Constants.DISABLE));
}