Johnny Blaze

Hi Everyone! I'm trying to get 100% code coverage for a particular service class, but a dynamic search method that I successfully implemented is denying me from obtaining that. Please help. The method uses the criteria api to return search results from a MySQL database. Here is the method.

public List<SearchResponseDTO> searchChangeRequest(SearchRequest searchRequest) {        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();        CriteriaQuery<ChangeRequest> criteriaQuery = criteriaBuilder.createQuery(ChangeRequest.class);        Root<ChangeRequest> root = criteriaQuery.from(ChangeRequest.class);        String appCode = searchRequest.getAppCode();        String shortDescription = searchRequest.getShortDescription();        String requestedBy = searchRequest.getRequestedBy();        String changeTicketNum = searchRequest.getChangeTicketNum();        String assignedTo = searchRequest.getAssignedTo();        String month = searchRequest.getMonth();        String year = searchRequest.getYear();        LocalDate firstDayOfMonth = null;        LocalDate lastDayOfMonth = null;        try {            Month monthEnum = Month.valueOf(month.toUpperCase());            firstDayOfMonth = Year.parse(year).atMonth(monthEnum).atDay(1).with(TemporalAdjusters.firstDayOfMonth());            lastDayOfMonth = Year.parse(year).atMonth(monthEnum).atDay(1).with(TemporalAdjusters.lastDayOfMonth());        } catch (IllegalArgumentException Exception) {            log.info("search can continue without month and year");        }        String status = searchRequest.getStatus();        List<Predicate> searchCriteria = new ArrayList<>();        if ((appCode != BaseConstants.BLANK_STRING) && (appCode != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("eaiCode"), "%" + eaiCode + "%"));        }        if ((shortDescription != BaseConstants.BLANK_STRING) && (shortDescription != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("shortDescription"), "%" + shortDescription + "%"));        }        if ((requestedBy != BaseConstants.BLANK_STRING) && (requestedBy != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("requestedBy"), "%" + requestedBy + "%"));        }        if ((changeTicketNum != BaseConstants.BLANK_STRING) && (changeTicketNum != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("changeTicketNum"), "%" + changeTicketNum + "%"));        }        if ((assignedTo != BaseConstants.BLANK_STRING) && (assignedTo != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("assignedTo"), "%" + assignedTo + "%"));        }        if (firstDayOfMonth != null && lastDayOfMonth != null && lastDayOfMonth.isAfter(firstDayOfMonth)) {            searchCriteria.add(criteriaBuilder.between(root.get("firstTaskDate"), firstDayOfMonth, lastDayOfMonth));        }        if ((status != BaseConstants.BLANK_STRING) && (status != null)) {            searchCriteria.add(criteriaBuilder.like(root.get("changeTicketStatus"), "%" + status + "%"));        }        criteriaQuery.select(root).where(criteriaBuilder.and(searchCriteria.toArray(new Predicate[searchCriteria.size()])));        return ChangeRequestMapper.setSearchResponseList(entityManager.createQuery(criteriaQuery).getResultList());    }

All lines are covered except for when it hits the 2nd to the last line. It throws a NullPointerException. Here is the unit test so far:

@ExtendWith(SpringExtension.class) @DisplayName("Change Request Service Test") public class ChangeRequestServiceTest {    @Mock    ChangeRequestRepository repository;    @Mock    EntityManagerFactory entityManagerFactory;    @Mock    EntityManager entityManager;    @Mock    CriteriaBuilder criteriaBuilder;    @Mock    CriteriaQuery<ChangeRequest> criteriaQuery;    @Mock    Root<ChangeRequest> root;    @Spy    @InjectMocks    ChangeRequestService service; @Test    public void searchChangeRequestTest() {        SearchRequest searchRequest = new SearchRequest("000000", "description", "user",                "12345", "user", "December", "2020", "New");        when(entityManagerFactory.createEntityManager()).thenReturn(entityManager);        when(entityManager.getCriteriaBuilder()).thenReturn(criteriaBuilder);        when(criteriaBuilder.createQuery(ChangeRequest.class)).thenReturn(criteriaQuery);        when(criteriaQuery.from(ChangeRequest.class)).thenReturn(root);        //something needs to go here in order for it to succeed and output the searchResponseDTO        service.searchChangeRequest(searchRequest);    }