java - 在这个涉及数据分页的 Java 方法中可以对什么进行单元测试？

Question

单元测试的初学者。以下是要测试的方法 -

public ListBeneficiaryResponseDTO getBeneficiaryOfMerchants(Long merchantId, Integer page, Integer pageSize,
                                                       String sortDirection, String sortField) {
        LOGGER.info("Inside getBeneficiaryOfMerchants method");

        // default we are setting to added on desc sort
        Sort sort = Sort.by(Sort.Direction.DESC,"addedOn");
        if(sortField != null && sortDirection != null) {
            sort = Sort.by(Sort.Direction.fromString(sortDirection),sortField);
        }

        Pageable pageRequest = PageRequest.of(page-1, pageSize, sort);
        Page<Beneficiary> pageOfBeneficiaries = beneficiaryRepository.findAllByMerchantId(merchantId, pageRequest);

        List<BeneficiaryResponseDTO> benResonseDtoList = new ArrayList<BeneficiaryResponseDTO>();

        for( Beneficiary ben: pageOfBeneficiaries.getContent()) {
            benResonseDtoList.add(this.getBeneficiaryResponseDTO(ben));
        }
        ListBeneficiaryResponseDTO formattedListBen = new ListBeneficiaryResponseDTO(pageOfBeneficiaries.getTotalPages(),pageOfBeneficiaries.getTotalElements(),pageOfBeneficiaries.getNumber(),benResonseDtoList);
        return formattedListBen;
    }

为了编写测试，我想，考虑到底层方法调用工作正常，这个方法会做错什么。好吧，我不确定，但将元素放入列表时可能会出现一些错误。

因此，我想编写一个测试来确保列表 benResonseDtoList 中存在预期数量的元素。

以下是我尝试过的 -

@Test
public void testGetBeneficiariesOfMerchant() throws Exception {

    Long merchantId = 2l;
    List<Beneficiary> beneficiaryList = new ArrayList<Beneficiary>();
    beneficiaryList.add(getBeneficiaryDto());
    beneficiaryList.add(getBeneficiaryDto());


    Page<Beneficiary> beneficiaries = new PageImpl<Beneficiary>(beneficiaryList); //But I am not sure how many entries are there in the page created.
Mockito.when(beneficiaryRepository.findAllByMerchantId(any(),any())).thenReturn(beneficiaries);
KeyManager keyManager = Mockito.mock(KeyManager.class);


ListBeneficiaryResponseDTO list = beneficiaryService.getBeneficiaryOfMerchants(merchantId,1,2, "DESC","addedOn");

如果 beneficiaryList 中的元素数量与 pageOfBeneficiaries 中的条目之间存在明显的相关性，我可以对此进行测试。

Answer 1

如果我正确理解您的问题，您想了解 getBeneficiaryOfMerchants() 函数的测试场景(给定下划线函数是否正常工作)。

对于给定的

merchantId, page, pageSize, sortDirection, sortField

ListBeneficiaryResponseDTO 将被修复，我们将其称为 ListBeneficiaryResponseDTO expectedList (您必须构建它，因为您已经知道正确的输出)

所以你应该比较以下内容:-

实际输出:

ListBeneficiaryResponseDTO actualList =  beneficiaryService.getBeneficiaryOfMerchants(merchantId,1,2, "DESC","addedOn");

预期输出:ListBeneficiaryResponseDTO预期列表(上面已定义)

比较两个输出:-

1. 逐个字段比较 actualList 和 expectedList

2. 重写 ListBeneficiaryResponseDTO 类的 Equals 方法(或者您可以使用 lombok.EqualsAndHashCode 来避免样板代码)并执行以下操作:-assertEquals(**actualList**, **expectedList**)