code: @Test(expected=AmbariException.class) public void testModifyPassword() throws Exception {
    users.createUser("user","user");
    UserEntity userEntity=userDAO.findLocalUserByName("user");
    assertNotSame("user",userEntity.getUserPassword());
    assertTrue(passwordEncoder.matches("user",userEntity.getUserPassword()));
    users.modifyPassword("user","user","resu");
    assertNotSame(userEntity.getUserPassword(),userDAO.findLocalUserByName("user").getUserPassword());
    users.modifyPassword("user","error","new");
    fail("Exception was not thrown");
  }
  