@Test
  public void testSynchronizeLdapUsersAndGroupsPostProcessExistingUsersHookDisabled() throws Exception {
    testSynchronizeLdapUsersAndGroups(true, false);
  }
Ensure that RollbackException is thrown outside the updateClusters method
when a unique constraint violation occurs.
ambari-server/src/test/java/org/apache/ambari/server/controller/AmbariManagementControllerImplTest.java