java.lang.AssertionError: Status Expected:<200> but was:<400> in testing class with junit - spring

Question

I need some help with my code. I have this controller:
#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);
}
and this testing class
#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());
}
When I try to test it, it gives me the following trace
java.lang.AssertionError: Status expected:<200> but was:<404> at
org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:55)
at
org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:82)
at
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
com.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)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at
org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at
org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at
org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at
org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at
org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at
org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at
org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at
org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at
org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
I think it's a configuration problem, can anyone notice where is the code failure?