Модульные тесты для API-контроллера Rest

Я пытаюсь проверить пружинный контроллер с помощью Мокито, но это не работает.

Это мой контроллер:

@RestController
public class CandidateController {

    private static final Logger log = LoggerFactory.getLogger(CandidateController.class);
    private CandidateService candidateService;

    @Autowired
    public CandidateController(CandidateService candidateService) {
        this.candidateService = candidateService;
    }

    @GetMapping("/candidates")
    public ResponseEntity<List<Candidate>> getAllCandidates() {
        List<Candidate> candidates = candidateService.findAll();
        log.info("Candidates list size = {}", candidates.size());
        if (candidates.size() == 0) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.ok(candidates);
    }


    @GetMapping("/candidates/{id}")
    public ResponseEntity<Candidate> getCandidateById(@PathVariable int id) {
        Candidate candidate = candidateService.findById(id);
        if (candidate != null) {
            return ResponseEntity.ok(candidate);
        } else {
            log.info("Candidate with id = {} not found", id);
            return ResponseEntity.notFound().build();
        }

    }

    @GetMapping("/candidates/name/{name}")
    public ResponseEntity<List<Candidate>> getCandidatesWhereNameLike(@PathVariable String name) {
        List<Candidate> candidates = candidateService.findByLastNameLike("%" + name + "%");
        log.info("Candidates by name list size = {}", candidates.size());
        if (candidates.isEmpty()) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.ok(candidates);
    }

    @PostMapping("/candidates/create")
    public ResponseEntity<Object> postCandidate(@Valid @RequestBody Candidate candidate) {
        Candidate newCandidate = candidateService.save(candidate);
        if (newCandidate != null) {
            URI location = ServletUriComponentsBuilder
                    .fromCurrentRequest()
                    .path("/{id}")
                    .buildAndExpand(newCandidate.getId())
                    .toUri();
            return ResponseEntity.created(location).build();
        } else {
            log.info("Candidate is already existing or null");
            return ResponseEntity.unprocessableEntity().build();
        }

    }

    @PutMapping("/candidates/{id}")
    public ResponseEntity<Object> updateCandidate(@PathVariable int id, @RequestBody Candidate candidate) {
        candidateService.update(candidate, id);
        candidate.setId(id);
        return ResponseEntity.noContent().build();
    }

    @DeleteMapping("/candidates/{id}")
    public ResponseEntity<Void> deleteCandidate(@PathVariable int id) {
        candidateService.deleteById(id);
        return ResponseEntity.noContent().build();
    }

Это моя служба:

@Service
public class CandidateServiceImpl implements CandidateService {

    private CandidateRepository candidateRepository;
    private static final Logger log = LoggerFactory.getLogger(CandidateServiceImpl.class);

    public CandidateServiceImpl() {

    }

    @Autowired
    public CandidateServiceImpl(CandidateRepository repository) {
        this.candidateRepository = repository;
    }

    @Override
    public List<Candidate> findAll() {
        List<Candidate> list = new ArrayList<>();
        candidateRepository.findAll().forEach(e -> list.add(e));
        return list;
    }

    @Override
    public Candidate findById(int id) {
        Candidate candidate = candidateRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException(id));
        return candidate;
    }

    @Override
    public Candidate findBySocialNumber(int number) {
        Candidate candidate = candidateRepository.findBySocialNumber(number).orElse(null);
        return candidate;
    }

    @Override
    public List<Candidate> findByLastNameLike(String userName) {
        return candidateRepository.findByLastNameLike(userName).orElseThrow(() -> new ResourceNotFoundException(0, "No result matches candidates with name like : " + userName));
    }

    @Override
    public Candidate save(Candidate candidate) {
        Candidate duplicateCandidate = this.findBySocialNumber(candidate.getSocialNumber());
        if (duplicateCandidate != null) { // Candidat existant avec numéro sécuAucun Candidat avec ce numéro sécu
            log.info("Candidate with username = {} found in database", candidate.getSocialNumber());
            throw new ResourceAlreadyExistException("Social security number : " + (candidate.getSocialNumber()));
        }
        log.info("Candidate with social number = {} found in database", candidate.getSocialNumber());
        return candidateRepository.save(candidate);
    }

    @Override
    public void update(Candidate candidate, int id) {
        log.info("Candidate to be updated : id = {}", candidate.getId());
        Candidate candidateFromDb = this.findById(id);
        if (candidateFromDb != null) {
            // Candidate présent => update
            candidate.setId(id);
            candidateRepository.save(candidate);
        } else {
            // Candidate absent => no update
            log.info("Candidate with id = {} cannot found in the database", candidate.getId());
            throw new ResourceNotFoundException(id);
        }
    }


    @Override
    public void deleteById(int id) {
        Candidate candidate = this.findById(id);
        if (candidate != null) {
            candidateRepository.delete(candidate);
        } else {
            throw new ResourceNotFoundException(id);
        }
    }
}

Мой тестовый файл:

@RunWith(SpringRunner.class)
@WebMvcTest(value = CandidateController.class, secure = false)
public class CandidateControllerTestMockito {


    //parse date to use it in filling Candidate model
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = format.format(new Date());
    Date date = format.parse("2009-12-31");


    static private List<Candidate> candidates = new ArrayList<>();


    static Candidate candidate = new Candidate();
    {
        candidate.setId(1);
        candidate.setLastName("pierre");
        candidate.setFirstName("pust");
        candidate.setBirthDate(date);
        candidate.setNationality("testFrancaise");
        candidate.setBirthPlace("testParis");
        candidate.setBirthDepartment("test92");
        candidate.setGender("testMale");
        candidate.setSocialNumber(1234);
        candidate.setCategory("testCategory");
        candidate.setStatus("testStatus");
        candidate.setGrade("testGrade");
        candidate.setFixedSalary(500);
        candidate.setPrivatePhoneNumber(0707070707);
        candidate.setPrivateEmail("[email protected]");
        candidate.setPosition("testPosition");
        candidate.setStartingDate(date);
        candidate.setSignatureDate(date);
        candidate.setContractStatus("testContractStatus");
        candidate.setContractEndDate("testContractEnd");
        candidate.setIdBusinessManager(1);
        candidate.setIdAdress(12);
        candidate.setIdMissionOrder(11);

        candidates.add(candidate);
    }



    @Autowired
    private MockMvc mockMvc;


    @MockBean
    private CandidateService candidateService;


    public CandidateControllerTestMockito() throws ParseException {
    }




    @Test
    public void findAll() throws Exception {

        when(
                candidateService.findAll()).thenReturn(candidates);


        RequestBuilder requestBuilder = get(
                "/candidates").accept(
                MediaType.APPLICATION_JSON);

        MvcResult result = mockMvc.perform(requestBuilder).andReturn();

        System.out.println("ici"+candidates.toString());

        String expected = "[{\"lastName\":\"pierre\",\"firstName\":\"pust\",\"birthDate\":1262214000000,\"nationality\":\"testFrancaise\",\"birthPlace\":\"testParis\",\"birthDepartment\":\"test92\",\"gender\":\"testMale\",\"socialNumber\":1234,\"category\":\"testCategory\",\"status\":\"testStatus\",\"grade\":\"testGrade\",\"fixedSalary\":500.0,\"privatePhoneNumber\":119304647,\"privateEmail\":\"[email protected]\",\"position\":\"testPosition\",\"schoolYear\":null,\"startingDate\":1262214000000,\"signatureDate\":1262214000000,\"contractStatus\":\"testContractStatus\",\"contractEndDate\":\"testContractEnd\",\"idBusinessManager\":1,\"idAdress\":12,\"idMissionOrder\":11}]";


        JSONAssert.assertEquals(expected, result.getResponse()
               .getContentAsString(), false);
    }



    @Test
    public void findByIdOk() throws Exception {

        when(candidateService.findById(candidate.getId())).thenReturn(candidate);
        Candidate cand=candidateService.findById(candidate.getId());
        int idCand=cand.getId();
        assertEquals(idCand,1);

        RequestBuilder requestBuilder = get(
                "/candidates/1").accept(
                MediaType.APPLICATION_JSON);

        MvcResult result = mockMvc.perform(requestBuilder).andReturn();

        MockHttpServletResponse response = result.getResponse();
        assertEquals(HttpStatus.OK.value(), response.getStatus());

    }

    @Test
    public void findByIdFail() throws Exception {

        when(candidateService.findById(18)).thenReturn(null);


        RequestBuilder requestBuilder = get(
                "/candidates/18").accept(
                MediaType.APPLICATION_JSON);

        MvcResult result = mockMvc.perform(requestBuilder).andReturn();

        MockHttpServletResponse response = result.getResponse();
        assertEquals(HttpStatus.NOT_FOUND.value(), response.getStatus());

    }





    @Test
    public void deleteCandidate() throws Exception{

        when(candidateService.findById(candidate.getId())).thenReturn(candidate);
        doNothing().when(candidateService).deleteById(candidate.getId());

        mockMvc.perform(
                delete("/candidates/{id}", candidate.getId()))
                .andExpect(status().isNoContent());

    }

спрашиваю правильно ли я поступаю или нет? и я хочу сделать ТЕСТ для deleteCandidateDontExist Я старался :

when(candidateService.findById(candidate.getId())).thenReturn(null);
        doNothing().when(candidateService).deleteById(candidate.getId());
 mockMvc.perform(...

Ожидаю ответа с 404 not found, но получаю ответ с 204 без содержания!