如何使用Mockito框架模擬我的服務

您好，我正在努力按照下面的方法撰寫模擬測驗；

我的代碼如下；

@Component
public class CodeConfigBuilder {

    @Value("${promoConfig.prefix.length}")
    private Integer prefixLength;

    public void validateRequestAndSetDefaults(PromoRequest promoRequest) {
        prefixAndPostFixControlAccordingToLength(promoRequest);
    }

    private void prefixAndPostFixControlAccordingToLength(PromoRequest promoRequest) {
        if (promoRequest.getPostfix() != null) {
            int lengthControl = prefixLength   promoRequest.getPostfix().length();
            if (lengthControl >= promoRequest.getLength()) {
                throw new BadRequestException(Constant.ClientConstants.THE_SUM_OF_PREFIX_AND_POSTFIX_CAN_NOT_BE_GREATER_THAN_LENGHT);
            }
        }    
    }
}

我的yml配置如下；

 #=========  Promo  Config  ========== #
    
        promoConfig:
          prefix:
            length: 3

我的服務如下；

public void validateRequest(PromoRequest promoRequest) {
      
        codeConfigBuilder.validateRequestAndSetDefaults(promoRequest);
    }

我有一個創建的 PropertySourceResolver 類

@Component
@Getter
public class PropertySourceResolver {
private int prefixLength = 3;

和我下面的測驗課；

@RunWith(MockitoJUnitRunner.class)
class CodeConfigBuilderTest {

   @MockBean
    private PropertySourceResolver propertySourceResolver = new PropertySourceResolver();
    @InjectMocks
    private PromoRequest promoRequest = new PromoRequest();
    @InjectMocks
    private PromoService Service;

   @Before
    public void init() {

        promoRequest.setPrefix("ABC");
        promoRequest.setPostfix("ABCDABCD");
        promoRequest.setQuantity(10);
        promoRequest.setLength(12);
        promoRequest.setCharset("ABCDEF");
    }

    @Test
    public void prefixAndPostFixControl_accordingToLength_for_Succeed() {

        int lengthControl = promoRequest.getPrefix().length()   promoRequest.getPostfix().length();

        if (lengthControl >= promoRequest.getLength()) {
            Assert.assertTrue(false);
        }
    }

我喜歡根據測驗場景更改我的代碼，例如；什么時候......然后回傳任何想法？謝謝你。

uj5u.com熱心網友回復：

為了使這更簡單并更好地組織您的代碼，請通過創建以下類來抽象化注入配置的復雜性：

@ConfigurationProperties(prefix = "promoConfig.prefix")
public class PromoPrefixConfiguration {
    private Integer length;

    public Integer getLength() {
        return length;
    }
}

然后，您應該將其作為以下項的依賴項CodeConfigBuilder：

@Component
public class CodeConfigBuilder {

    private Integer prefixLength;

    public CodeConfigBuilder(PromoPrefixConfiguration promoPrefixConfiguration) {
        this.prefixLength = promoPrefixConfiguration.getLength();
    }

    public void validateRequestAndSetDefaults(PromoRequest promoRequest) {
        prefixAndPostFixControlAccordingToLength(promoRequest);
    }

    private void prefixAndPostFixControlAccordingToLength(PromoRequest promoRequest) {
        if (promoRequest.getPostfix() != null) {
            int lengthControl = prefixLength   promoRequest.getPostfix().length();
            if (lengthControl >= promoRequest.getLength()) {
                throw new BadRequestException(Constant.ClientConstants.THE_SUM_OF_PREFIX_AND_POSTFIX_CAN_NOT_BE_GREATER_THAN_LENGHT);
            }
        }    
    }
}

現在，為了測驗這個類，你必須通過三個測驗來完成：

1. 測驗PromoRequest有效，因為它postfix為空；
2. 測驗PromoRequest有效，因為長度有效；
3. PromoRequest由于長度無效而無效的測驗；

它們將類似于以下內容：

class CodeConfigBuilderTest {

    private PromoPrefixConfiguration promoPrefixConfiguration = new PromoPrefixConfiguration(10);
    private CodeConfigBuilder codeConfigBuilder = new CodeConfigBuilder(promoPrefixConfiguration);

    @Test
    public void promoRequestIsValidGivenNullPostfix() {
        // Arrange
        PromoRequest promoRequest = new PromoRequest();
        promoRequest.setPostfix(null);

        // Act
        codeConfigBuilder.validateRequestAndSetDefaults(promoRequest);
    }

    @Test
    public void promoRequestIsValidGivenValidPrefixPlusPostfixLength() {
        // Arrange
        PromoRequest promoRequest = new PromoRequest();
        promoRequest.setPostfix("ABCD");
        promoRequest.setLength(15);

        // Act
        codeConfigBuilder.validateRequestAndSetDefaults(promoRequest);
    }

    @Test(expected = BadRequestException.class)
    public void promoRequestIsInvalidGivenInvalidPrefixPlusPostfixLength() {
        // Arrange
        PromoRequest promoRequest = new PromoRequest();
        promoRequest.setPostfix("ABCDEFGH");
        promoRequest.setLength(15);

        // Act
        codeConfigBuilder.validateRequestAndSetDefaults(promoRequest);
    }
}

如果您使用的是 JUnit 5，您可以用以下測驗替換最后一個測驗，以輕松斷言例外訊息：

@Test
public void promoRequestIsInvalidGivenInvalidPrefixPlusPostfixLength() {
    // Arrange
    PromoRequest promoRequest = new PromoRequest();
    promoRequest.setPrefix("ABCDEFG");
    promoRequest.setPostfix("HIJKLMN");

    // Act 
    Exception exception = assertThrows(BadRequestException.class, () -> {
        codeConfigBuilder.validateRequestAndSetDefaults(promoRequest);
    });

    // Assert
    String exceptionMessage = exception.getMessage();
    assertTrue(exceptionMessage.equals(Constant.ClientConstants.THE_SUM_OF_PREFIX_AND_POSTFIX_CAN_NOT_BE_GREATER_THAN_LENGHT));
}

PS：你的意思是suffix而不是postfix？

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