@Parameterized.Parameters
  public static List<Object[]> data() {
    return Arrays.asList(new Object[][]{{false, false}, {true, false}, {false, true}, {true, true}});
  }
Test {@link HelixClusterChangeHandler} to verify its behavior is expected when handling cluster changes.
ambry-clustermap/src/test/java/com/github/ambry/clustermap/ClusterChangeHandlerTest.java