code: @Test public void testCreateServiceComponentSimple() throws AmbariException {
    String clusterName="foo1";
    createCluster(clusterName);
    String serviceName="HDFS";
    createService(clusterName,serviceName,null);
    String componentName="NAMENODE";
    try {
      createServiceComponent(clusterName,serviceName,componentName,State.INSTALLING);
      fail("ServiceComponent creation should fail for invalid state");
    }
   catch (  Exception e) {
    }
    try {
      clusters.getCluster(clusterName).getService(serviceName).getServiceComponent(componentName);
      fail("ServiceComponent creation should have failed");
    }
   catch (  Exception e) {
    }
    createServiceComponent(clusterName,serviceName,componentName,State.INIT);
    Assert.assertNotNull(clusters.getCluster(clusterName).getService(serviceName).getServiceComponent(componentName));
    ServiceComponentRequest r=new ServiceComponentRequest(clusterName,serviceName,null,null,null);
    Set<ServiceComponentResponse> response=controller.getComponents(Collections.singleton(r));
    Assert.assertEquals(1,response.size());
    ServiceComponentResponse sc=response.iterator().next();
    Assert.assertEquals(State.INIT.toString(),sc.getDesiredState());
    Assert.assertEquals(componentName,sc.getComponentName());
    Assert.assertEquals(clusterName,sc.getClusterName());
    Assert.assertEquals(serviceName,sc.getServiceName());
  }
  