如何使用mockito在服務測驗中模擬工廠方法-有解無憂

嗨，我正在嘗試測驗服務層。我已經為ConverterFactory. 我想我需要ConverterServiceImpl使用但我仍然得到的模擬依賴類NullPointerException

這是我的服務類

@Service
@RequiredArgsConstructor
public class ConverterServiceImpl implements ConverterService {

    ConverterFactory factory = new ConverterFactory();
    private final WebLinkRepository webLinkRepository;
    private final DeepLinkRepository deepLinkRepository;

    @Override
    public DeepLinkResponse toDeepLink(WebLinkRequest webLinkRequest) {

        WebLink webLink;
        String url = webLinkRequest.getUrl();
        Converter converter = factory.getConverter(url);


        webLink = new WebLink();
        webLink.setUrl(url);
        String convertedUrl = converter.toDeepLink(url);
        webLink.setConvertedUrl(convertedUrl);
        webLinkRepository.save(webLink);

        return new DeepLinkResponse(convertedUrl);
    }
}

這是測驗

@RunWith(MockitoJUnitRunner.class)
public class ConverterServiceImplTest {


    @InjectMocks
    ConverterServiceImpl converterService;

    @Mock
    WebLinkRepository webLinkRepository;

    @Mock
    DeepLinkRepository deepLinkRepository;

    @Mock
    ConverterFactory converterFactory;

    @Mock
    ProductConverter productConverter;

    @Mock
    WebLinkRequest webLinkRequest;

    @BeforeAll
    void init(){
        webLinkRequest.setUrl(WEBLINK_ONLY_PRODUCT);
    }

    @Test
    public void toDeepLink_only_content_id() {
        ConverterFactory converterFactory = mock(ConverterFactory.class);
        when(converterFactory.getConverter(any())).thenReturn(productConverter);

        DeepLinkResponse deepLinkResponse = converterService.toDeepLink(webLinkRequest);
        assertEquals(deepLinkResponse.getUrl(),"ty://?Page=Product&ContentId=1925865");

    }
}

這段代碼拋出錯誤說。我在這里做錯了什么？：

java.lang.NullPointerException
    at com.example.converter.service.factory.ConverterFactory.getConverter(ConverterFactory.java:13)

uj5u.com熱心網友回復：

您不需要ConverterFactory converterFactory = mock(ConverterFactory.class)在測驗方法中再次創建，因為您已經創建了這樣的模擬作為類欄位。

此外，您沒有將在測驗方法中創建的模擬注入到被測類中，而創建為欄位的模擬是使用@InjectMocks注解注入的。

所以只需ConverterFactory converterFactory = mock(ConverterFactory.class)從測驗方法中洗掉：

@RunWith(MockitoJUnitRunner.class)
public class ConverterServiceImplTest {


    @InjectMocks
    ConverterServiceImpl converterService;

    @Mock
    ConverterFactory converterFactory;

    // other stuff


    @Test
    public void toDeepLink_only_content_id() {
        when(converterFactory.getConverter(any())).thenReturn(productConverter);

        // other stuff

        converterService.toDeepLink(webLinkRequest);
    }
}

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