我正在嘗試使用 spring boot 學習 junit 測試。通常我不會只問空指針異常，但現在我找不到丟失的東西。@RunWith(SpringRunner.class)@SpringBootTest(webEnvironment = WebEnvironment.MOCK)@ActiveProfiles("dev")@AutoConfigureMockMvc@WithMockUser(username = "user", password = "secret", authorities = "USER")public class OwnersWebMVCTests {    @Autowired    private MockMvc mockMvc;    @Test    public void testOwners() throws Exception {        MockHttpServletRequestBuilder requestBuilder = MockMvcRequestBuilders.get("/owners");        ResultActions resultActions = mockMvc.perform(requestBuilder);        MvcResult mvcResult = resultActions.andReturn();        ModelAndView mav = mvcResult.getModelAndView();        MatcherAssert.assertThat(mav.getViewName(), Matchers.equalTo("owners"));        MatcherAssert.assertThat(mav.getModel().containsKey("owners"), Matchers.is(true));    }}ModelAndView mav = mvcResult.getModelAndView(); 返回 null。