ResultMessageUtils { private ResultMessageUtils() { } private  ResultMessageUtils(); static String resolveMessage(ResultMessage message,
            MessageSource messageSource,
            Locale locale); static String resolveMessage(ResultMessage message,
            MessageSource messageSource);  }
@Test public void testResultMessageUtils() throws Exception { Constructor<ResultMessageUtils> constructor = ResultMessageUtils.class .getDeclaredConstructor(); assertThat(constructor.isAccessible(), is(false)); constructor.setAccessible(true); assertThat(constructor.newInstance(), notNullValue()); constructor.setAccessible(false); }