@Test
 public void getServletConfigClasses() throws Exception {
   Class<?>[] servletConfigClasses = appWebApplicationInitializer.getServletConfigClasses();
   assertThat(servletConfigClasses, containsItemsOf(AppWebMvcConfiguration.class));
 }
 @Test
 public void getServletMappings() throws Exception {
   assertThat(appWebApplicationInitializer.getServletMappings(), containsItemsOf("/"));
 }
 @Test
 public void getRootConfigClasses() throws Exception {
   assertThat(appWebApplicationInitializer.getRootConfigClasses(), isEmpty());
 }