я тестирую метод beforeCheckOperation, как сделать чтобы вернуть  return FraudUtils.CODE_BLOCK;?

@Override
    public String beforeCheckOperation(FraudCheckRequest request) {
        if (!ACQUIRING.name().equals(request.getOperationType())) {
            // Пришел странный тип операции
            return FraudUtils.PAYMENT_SYSTEM_CRASH;
        }
        Long operationId = request.getOperationId();
        List<FraudCheck> checks = fraudCheckManager.getFraudCheckList(acquiringHelpService.getAcquirerFromAcquiringOperation(operationId)).
                stream().filter(p -> FraudStageType.PRE_CHECK.name().equals(p.getStage())).toList();
        log.info("[beforeCheckOperation] operationId = {}", operationId);
        for (FraudCheck fraudCheck : checks) {
            log.info("[beforeCheckOperation] fraudCheck = {}", fraudCheck.getType());
            if (CARD_IS_BLOCKED.name().equals(fraudCheck.getType())) {
                if (!checkCard(operationId, ACQUIRING, request.getPan(), request.getBin(), request.getIssuerCode())) {
                    return FraudUtils.CODE_BLOCK;
                }
            }
            if (ACCOUNT_IS_BLOCKED.name().equals(fraudCheck.getType())) {
                if (!checkAccount(request.getAccount())) {
                    return FraudUtils.ACCOUNT_BLOCK;
                }
            }
            if (PARTNER_IS_BLOCKED.name().equals(fraudCheck.getType())) {
                if (!checkPartner(request.getPartnerId())) {
                    return FraudUtils.PARTNER_BLOCK;
                }
            }
        }

        List<FraudCheck> limitChecks = checks.stream().filter(f -> limitNames.contains(f.getType())).toList();

        if (!limitChecks.isEmpty() && StringUtils.isNotEmpty(request.getPartnerId())) {
            String errorCode = checkLimit(limitChecks, request);
            if (errorCode != null) {
                return errorCode;
            }
        }


        // Все норм - вернем null
        return null;
    }

@Override
    public boolean checkCard(Long operationId, OperationType type, String pan, String bin, String issuerCode) {
        List<FraudCheck> checks = fraudCheckManager.getFraudCheckList(ACQUIRING.equals(type) ? acquiringHelpService.getAcquirerFromAcquiringOperation(operationId) : acquiringHelpService.getAcquirerFromBusinessOperation(operationId)).
                stream().filter(p -> FraudCheckType.CARD_IS_BLOCKED.name().equals(p.getType())).toList();
        if (checks.isEmpty()) {
            log.info("[checkCard] Проверка не требуется (operationId = {})", operationId);
            return true;
        }
        log.info("[checkCard] Проводим проверку (operationId = {})", operationId);

        // true если не заблокирована карта и либо bin пустой либо issuerCode пустой либо не заблокирован БИН и Банк
        return !fraudLockManager.isCardBlock(pan) &&
                ( StringUtils.isEmpty(bin) || StringUtils.isEmpty(issuerCode) || (!fraudLockManager.isBinBlock(bin) && !fraudLockManager.isBankBlock(issuerCode)));
    }
мой тест выглядит так и он сейчас возвращает null
@Test
    void beforeCheckOperation_shouldReturnCodeBlock() {
        FraudCheckRequest checkRequest = new FraudCheckRequest();
        checkRequest.setOperationId(1L);
        checkRequest.setOperationType("ACQUIRING");
        checkRequest.setPan("220200000000000");
        checkRequest.setBin("220220");
        checkRequest.setIssuerCode("issuerCode");
        Partner partner = new Partner();
        partner.setId(1L);
        Long operationId = 1L;
        FraudCheck check = new FraudCheck();
        check.setId(1L);
        check.setType(FraudCheckType.CARD_IS_BLOCKED.name());
        check.setStage(FraudStageType.PRE_CHECK.name());
        List<FraudCheck> checkList = List.of(check);
        when(acquiringHelpService.getAcquirerFromAcquiringOperation(operationId)).thenReturn(partner);
        when(fraudCheckManager.getFraudCheckList(partner)).thenReturn(checkList);
        String result = fraudMonitoringServiceImpl.beforeCheckOperation(checkRequest);
        assertNull(result);
    }