MockMvc tests not working the same in 1.4

[dsyer]

This test is kind of unusual (in that it is its own configuration). It fails in 1.4 and passes in 1.3 though

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(SimpleIntegrationTests.class)
@WebAppConfiguration
@EnableAutoConfiguration(exclude = { JmxAutoConfiguration.class })
@RestController
public class SimpleIntegrationTests {

    private static Log logger = LogFactory.getLog(SimpleIntegrationTests.class);

    @Autowired
    private WebApplicationContext webApplicationContext;

    private MockMvc mockMvc;

    private static Object span;

    @Before
    public void setup() {
        DefaultMockMvcBuilder mockMvcBuilder = MockMvcBuilders
                .webAppContextSetup(this.webApplicationContext);
        this.mockMvc = mockMvcBuilder.build();
        SimpleIntegrationTests.span = null;
    }

    @RequestMapping("/ping")
    public String ping() {
        logger.info("ping");
        SimpleIntegrationTests.span = new Object();
        return "ping";
    }

    @RequestMapping("/future")
    public CompletableFuture<String> future() {
        logger.info("future");
        return CompletableFuture.completedFuture("ping");
    }

    @Test
    public void getCallsEndpoint() throws Exception {
        this.mockMvc.perform(get("/ping")).andReturn();
        assertThat(SimpleIntegrationTests.span).isNotNull();
    }

    @Test
    public void futureCreatesAsync() throws Exception {
        this.mockMvc.perform(get("/future")).andExpect(request().asyncStarted());
    }

}