Map<String, MediaType> mapping = Collections.singletonMap("json", MediaType.APPLICATION_JSON);
PathExtensionContentNegotiationStrategy pathStrategy = new PathExtensionContentNegotiationStrategy(mapping);
viewResolver.setContentNegotiationManager(new ContentNegotiationManager(pathStrategy));
ViewResolver viewResolverMock1 = mock(ViewResolver.class);
ViewResolver viewResolverMock2 = mock(ViewResolver.class);
viewResolver.setViewResolvers(Arrays.asList(viewResolverMock1, viewResolverMock2));
View viewMock1 = mock(View.class, "application_xml");
View viewMock2 = mock(View.class, "text_html");
View viewMock3 = mock(View.class, "application_json");
List<View> defaultViews = new ArrayList<View>();
defaultViews.add(viewMock3);
viewResolver.setDefaultViews(defaultViews);
viewResolver.afterPropertiesSet();
String viewName = "view";
Locale locale = Locale.ENGLISH;
given(viewResolverMock1.resolveViewName(viewName, locale)).willReturn(viewMock1);
given(viewResolverMock1.resolveViewName(viewName + ".json", locale)).willReturn(null);
given(viewResolverMock2.resolveViewName(viewName, locale)).willReturn(viewMock2);
given(viewResolverMock2.resolveViewName(viewName + ".json", locale)).willReturn(null);
given(viewMock1.getContentType()).willReturn("application/xml");
given(viewMock2.getContentType()).willReturn("text/html;charset=ISO-8859-1");
given(viewMock3.getContentType()).willReturn("application/json");
View result = viewResolver.resolveViewName(viewName, locale);