@Test
public void testProcessHostGroups() throws Exception {

  StackAdvisorRunner saRunner = mock(StackAdvisorRunner.class);
  File file = mock(File.class);
  AmbariMetaInfo metaInfo = mock(AmbariMetaInfo.class);
  ConfigurationRecommendationCommand command = new ConfigurationRecommendationCommand(file, "1w", "script", 1, saRunner, metaInfo);
  StackAdvisorRequest request = mock(StackAdvisorRequest.class);
  Map<String, Set<String>> componentHostGroupMap = new HashMap<String, Set<String>>();
  Set<String> components1 = new HashSet<String>();
  components1.add("component1");
  components1.add("component4");
  components1.add("component5");
  componentHostGroupMap.put("group1", components1);
  Set<String> components2 = new HashSet<String>();
  components2.add("component2");
  components2.add("component3");
  componentHostGroupMap.put("group2", components2);
  doReturn(componentHostGroupMap).when(request).getHostComponents();
  Set<RecommendationResponse.HostGroup> hostGroups = command.processHostGroups(request);
  assertNotNull(hostGroups);
  assertEquals(2, hostGroups.size());
  Map<String, RecommendationResponse.HostGroup> hostGroupMap =
      new HashMap<String, RecommendationResponse.HostGroup>();
  for (RecommendationResponse.HostGroup hostGroup : hostGroups) {
    hostGroupMap.put(hostGroup.getName(), hostGroup);
  }
  RecommendationResponse.HostGroup hostGroup1 = hostGroupMap.get("group1");
  assertNotNull(hostGroup1);
  Set<Map<String, String>> host1Components = hostGroup1.getComponents();
  assertNotNull(host1Components);
  assertEquals(3, host1Components.size());
  Set<String> componentNames1 = new HashSet<String>();
  for (Map<String, String> host1Component : host1Components) {
    assertNotNull(host1Component);
    assertEquals(1, host1Component.size());
    String componentName = host1Component.get("name");
    assertNotNull(componentName);
    componentNames1.add(componentName);
  }
  assertEquals(3, componentNames1.size());
  assertTrue(componentNames1.contains("component1"));
  assertTrue(componentNames1.contains("component4"));
  assertTrue(componentNames1.contains("component5"));
  RecommendationResponse.HostGroup hostGroup2 = hostGroupMap.get("group2");
  assertNotNull(hostGroup2);
  Set<Map<String, String>> host2Components = hostGroup2.getComponents();
  assertNotNull(host2Components);
  assertEquals(2, host2Components.size());
  Set<String> componentNames2 = new HashSet<String>();
  for (Map<String, String> host2Component : host2Components) {
    assertNotNull(host2Component);
    assertEquals(1, host2Component.size());
    String componentName = host2Component.get("name");
    assertNotNull(componentName);
    componentNames2.add(componentName);
  }
  assertEquals(2, componentNames2.size());
  assertTrue(componentNames2.contains("component2"));
  assertTrue(componentNames2.contains("component3"));
}