java.lang.AssertionError：状态预期：<200>但是在带有junit的测试类中是：<400>

我的代码需要一些帮助 . 我有这个控制器：

@RestController
@RequestMapping("/center")
public class CenterController {

private final Logger log = LoggerFactory.getLogger(CenterController.class);

@Autowired
private CenterService service;

@GetMapping(value = "/{idCenter}", produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(code = HttpStatus.OK)
public Center findBy(@PathVariable String idCenter) {
    log.debug("findBy --> Getting a center by id.");
    return service.findOne(idCenter);
}

和这个测试类

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ServiceTestConfiguration.class)
public class CenterControllerTest {

private final Logger log = LoggerFactory.getLogger(CenterControllerTest.class);

private MockMvc mockMvc;    
private ObjectMapper mapper; 
private Center center;
private Center center2;
private ArrayList<Center> listCenters;

@MockBean
private CenterService centerService;

@Autowired
private WebApplicationContext webApplicationContext;

@Before
public void setup() {
    log.debug("CenterControllerTest --> setup()");
    mapper = new ObjectMapper();
    loadData();
    CenterController centerController = new CenterController();
    this.mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
}

@After
public void teardown() {
    log.debug("CenterControllerTest --> teardown()");
    centerService.deleteAll();
}

private void loadData() {
    log.debug("centerControllerTest --> loadData() Loading test data");

    center = new Center();
    center.setIdCenter("1");
    center.setCenterCode("123");
    center.setStreet("Test street");
    center.setPopulation("Test population");
    center.setProvince("Test province");
    center.setPostalCode("Test postal code");
    center.setTelephone((long) 999888777);
    center.setActive(true);
    centerService.save(center);

}

@Test
public void getCenterByIdTest2() throws Exception{
    when(centerService.findOne("1")).thenReturn(new Center());
    mockMvc.perform(get("/center")
            .param("idCenter", "1"))
        .andExpect(status().isOk());
}

当我尝试测试它时，它给了我以下跟踪

java.lang.AssertionError：期望的状态：<200>但是在org.springframework.test.util.AssertionErrors.assertEquals的org.springframework.test.util.AssertionErrors.fail（AssertionErrors.java:55）中是：<404> （AssertionErrors.java:82）org.springframework.test.web.servlet.result.StatusResultMatchers.lambda $ matcher $ 9（StatusResultMatchers.java:619）at org.springframework.test.web.servlet.MockMvc $ 1.andExpect（MockMvc） .java：178）at.api.controller.CenterControllerTest.getCenterByIdTest2（CenterControllerTest.java:90）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）at java.lang.reflect.Method.invoke（Method.java:498）at org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50在org.junit.runners.mod的org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12） el.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）在org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）在org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate（ RunBeforeTestExecutionCallbacks.java:73）在org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate（RunAfterTestExecutionCallbacks.java:83）在org.junit.internal.runners.statements.RunBefores.evaluate（RunBefores.java:26）在org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate（RunBeforeTestMethodCallbacks.java:75）在org.junit.internal.runners.statements.RunAfters.evaluate（RunAfters.java:27）在org.springframework.test .context.junit4.statements.RunAfterTestMethodCallbacks.evaluate（RunAfterTestMethodCallbacks.java:86）在org.springframework.test.context.junit4.statements.SpringRepeat.evaluate（SpringRepeat.java:84）在org.junit.runners.ParentRunner.runLeaf （ParentRunner.java:325）at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild（SpringJUnit4ClassRunner.java:251）org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild（SpringJUnit4ClassRunner.java:97）at org.junit.runners.ParentRunner $ 3 .run（ParentRunner.java:290）位于org.junit.runners的org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288） .ParentRunner.access $ 000（ParentRunner.java:58）在org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268）在org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate（RunBeforeTestClassCallbacks.java ：61）atg.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate（RunAfterTestClassCallbacks.java:70）atg.junit.runners.ParentRunner.run（ParentRunner.java:363）org.springframework.test . org.eclipse.jdt.internal.j中的context.junit4.SpringJUnit4ClassRunner.run（SpringJUnit4ClassRunner.java:190） unit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）位于org.eclipse.jdt.internal.junit.runner的org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38） . RemoteTestRunner.runTests（RemoteTestRunner.java:538）维持在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:760）（ RemoteTestRunner.java:460）org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:206）

我认为这是一个配置问题，任何人都可以注意到代码失败的位置？