public void requestMappingHandlerAdapter() throws Exception {
delegatingConfig.setConfigurers(Arrays.asList(webMvcConfigurer));
RequestMappingHandlerAdapter adapter = delegatingConfig.requestMappingHandlerAdapter();
ConfigurableWebBindingInitializer initializer = (ConfigurableWebBindingInitializer) adapter.getWebBindingInitializer();
ConversionService initializerConversionService = initializer.getConversionService();
assertTrue(initializer.getValidator() instanceof LocalValidatorFactoryBean);
verify(webMvcConfigurer).configureMessageConverters(converters.capture());
verify(webMvcConfigurer).configureContentNegotiation(contentNegotiationConfigurer.capture());
verify(webMvcConfigurer).addFormatters(conversionService.capture());
verify(webMvcConfigurer).addArgumentResolvers(resolvers.capture());