code: @Test(expected=WroRuntimeException.class) public void shouldNotProcessGroupWithNoResources() throws Exception {
    final HttpServletRequest request=Mockito.mock(HttpServletRequest.class);
    final HttpServletResponse response=Context.get().getResponse();
    Mockito.when(request.getRequestURI()).thenReturn("/noResources.css");
    final WroConfiguration config=new WroConfiguration();
    config.setIgnoreEmptyGroup(false);
    Context.set(Context.webContext(request,response,Mockito.mock(FilterConfig.class)),config);
    final WroModel model=new WroModel();
    model.addGroup(new Group("noResources"));
    WroManagerFactory managerFactory=new BaseWroManagerFactory().setModelFactory(WroUtil.factoryFor(model));
    managerFactory=managerFactory;
    managerFactory.create().process();
  }
  