Executing functional tests of Spring MVC Controller with AnnotationConfig

AnnotationConfigWebApplicationContextLoader.java

public class AnnotationConfigWebApplicationContextLoader extends AnnotationConfigContextLoader {

    @Override
    protected void customizeBeanFactory(DefaultListableBeanFactory beanFactory) {
        MockServletContext servletContext = new MockServletContext();

        // copy of GenericWebApplicationContext#postProcessBeanFactory
        beanFactory.addBeanPostProcessor(new ServletContextAwareProcessor(servletContext));
        beanFactory.ignoreDependencyInterface(ServletContextAware.class);

        WebApplicationContextUtils.registerWebApplicationScopes(beanFactory, servletContext);
        WebApplicationContextUtils.registerEnvironmentBeans(beanFactory, servletContext);
    }
}

ControllerFunctionalTestBase.java

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(loader = AnnotationConfigWebApplicationContextLoader.class)
public abstract class ControllerFunctionalTestBase {

    @Autowired
    protected ApplicationContext context;

    protected MockHttpServletRequest request;
    protected MockHttpServletResponse response;
    protected HandlerAdapter ha;
    protected HandlerMapping mapping;

    @Configuration
    @EnableWebMvc
    @ComponentScan(basePackageClasses = ControllerFunctionalTestBase.class, excludeFilters = { @Filter(type = FilterType.ASSIGNABLE_TYPE, value = TestConfig.class) })
    static class TestConfig extends WebMvcConfigurerAdapter {
    }

    @Before
    public void setup() {
        request = new MockHttpServletRequest();
        request.setCharacterEncoding("UTF-8");

        response = new MockHttpServletResponse();
        response.setOutputStreamAccessAllowed(true);
        response.setCharacterEncoding("UTF-8");

        ha = context.getBean(RequestMappingHandlerAdapter.class);
        mapping = context.getBean(RequestMappingHandlerMapping.class);
    }

    public ModelAndView handle(HttpServletRequest request, HttpServletResponse response) {
        try {
            return ha.handle(request, response, mapping.getHandler(request).getHandler());

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

JsonControllerFunctionalTest.java

public class JsonControllerFunctionalTest extends ControllerFunctionalTestBase {

    @Test
    public void test_get() throws UnsupportedEncodingException {
        request.setMethod("GET");
        request.setRequestURI("/user/12345/get");

        handle(request, response);

        assertThat(response.getContentAsString(), is("{\"result\":true}"));
    }
}