SpringBoot Mockito：when..thenReturn 给出异常

Question

所以，目前，我正在测试服务 class

这是我的ConvertService.java

@Service
public class ConvertService {

  private final NetworkClient networkClient; //NetworkClient is a Service too

  private final ConvertUtility convertUtility; 

  public ConvertService(Network networkClient) {
    convertUtility = ConvertFactory.of("dev", "F");
    this.networkClient = networkClient

  }


  public Response convert(Request request) {

    User user = networkClient.getData(request.getId()); //User is POJO class
    Context context = convertUtility.transform(request.getToken()) //getToken returns a String
    //Context is a normal Java 

  }

}

这是我的ConvertServiceTest.java

@SpringBootTest
@RunWith(MockitoJunitRunner.class)
class ConvertServiceTest {

  @MockBean
  private NetworkClient networkClient;

  @Mock
  ConvertUtility convertUtility;

  private ConvertService convertService;

  @BeforeEach
  void setUp() {
    convertService = new ConvertService(networkClient);
  }

  private mockMethod() {
    Request request = Request(1000);
    User user = new User("user1");
    Context context = new Context();

    when(networkClient.getData(anyLong())).thenReturn(user);
    when(convertUtility.transform(any(String.class)).thenReturn(context);
     
     Response response = convertService.convert(request);  //it throws me an exception here
    }
  }

convertService.convert(request); 抛出异常

指向内部convertUtility.transform(request.getToken())

我不确定为什么它会处理来自 transform 方法的所有内容，当我写
when(convertUtility.transform(any(String.class)).thenReturn(context);

有人可以帮忙吗？

编辑：ConvertUtility 是只读库

Answer 1

在您的 public 构造函数中，您使用静态工厂方法获取 ConvertUtility 的实例。您必须模拟静态 ConvertUtility.of() 方法才能在测试期间使用模拟。

虽然 Mockito is able to mock static methods，但我建议重构（如果可能）您的 class 设计并接受 ConvertUtility 的实例作为 public 构造函数的一部分：

@Service
public class ConvertService {

  private final NetworkClient networkClient; //NetworkClient is a Service too
  private final ConvertUtility convertUtility;

  public ConvertService(Network networkClient, ConvertUtility convertUtility) {
    this.convertUtility = convertUtility
    this.networkClient = networkClient

  }
}

通过此更改，您可以在编写单元测试时轻松模拟 ConvertService 的协作者：

@ExtendWith(MockitoExtension.class)
class ConvertServiceTest {

   @Mock
   private NetworkClient networkClient;

   @Mock
   private ConvertUtility convertUtility;

   @InjectMocks
   private ConvertService convertService;

   @Test // make sure it's from org.junit.jupiter.api
   void yourTest() {


   }
}

SpringBoot Mockito：when..thenReturn 给出异常

SpringBoot Mockito: when..thenReturn giving an exception

java

unit-testing

exception

mockito

spring-boot