@Test
  public void testClientStop() {
    Configuration conf = new Configuration();
    ResourceManager rm = new ResourceManager();
    rm.init(conf);
    rm.start();

    YarnClient client = YarnClient.createYarnClient();
    client.init(conf);
    client.start();
    client.stop();
    rm.stop();
  }
 @After
 public void tearDown() throws Exception {
   resourceManager.stop();
 }