@Test
  public void willRejectIfMasterIsEmpty() throws Exception {
    config.setMaster(" ");

    validator.validate(config, errors);
    assertEquals("master.empty", errors.getFieldError("master").getCode());
  }
  @Test
  public void willNotRejectAGoodConfiguration() throws Exception {
    config.setMaster("leader.mesos:5050");
    config.setZookeeper(
        new ZookeeperConfigProperties() {
          {
            setServer("leader.mesos:2181");
          }
        });
    config.setResources(
        new ResourcesConfigProperties() {
          {
            setCpus(1.0);
            setMem(128);
          }
        });

    validator.validate(config, errors);

    assertEquals(0, errors.getErrorCount());
  }