我正在對服務方法進行單元測驗create product。此方法接收一個 Dto 物件，然后ProductEntity使用 . 將 Dto 物件傳輸到一個物件ModelMapper。這個方法作業得很好，但是當我對它進行單元測驗時，我像這樣模擬并modelMapper存根它是一個實體，它拋出when(modelMapper.map(createProductRequestDto, ProductEntity.class)).thenReturn(expectedProduct)expectedProductProductEntityjava.lang.ClassCastException
堆疊跟蹤：
java.lang.ClassCastException: class com.example.demo.dto.responses.product.ProductResponseDto$MockitoMock$737533970 cannot be cast to class com.example.demo.entities.ProductEntity (com.example.demo.dto.responses.product.ProductResponseDto$MockitoMock$737533970 and com.example.demo.entities.ProductEntity are in unnamed module of loader 'app')
at com.example.demo.services.implementations.product.ProductCrudServiceImpl.createProduct(ProductCrudServiceImpl.java:78)
at com.example.demo.services.product.ProductCrudServiceImplTest.createProduct_ShouldReturnProductResponseDto(ProductCrudServiceImplTest.java:136)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
createProduct服務方法：
@Override
public ProductResponseDto createProduct(CreateProductRequestDto createProductRequestDTO) {
Long genderId = createProductRequestDTO.getGenderId();
Long sportId = createProductRequestDTO.getSportId();
List<Long> categoryIds = createProductRequestDTO.getCategoryIds();
List<Long> technologyIds = createProductRequestDTO.getTechnologyIds();
GenderEntity genderEntity = genderCrudService.findById(genderId);
SportEntity sportEntity = sportCrudService.findById(sportId);
List<CategoryEntity> categoryEntities = categoryCrudService.findByIds(categoryIds);
List<TechnologyEntity> technologyEntities = technologyService.findByIds(technologyIds);
Set<TechnologyEntity> technologyEntitySet = technologyEntities.stream().collect(Collectors.toSet());
Set<CategoryEntity> categoryEntitySet = categoryEntities.stream().collect(Collectors.toSet());
ProductEntity productEntity = modelMapper.map(createProductRequestDTO, ProductEntity.class);
productEntity.setTechnologies(technologyEntitySet);
productEntity.setCategories(categoryEntitySet);
productEntity.setGender(genderEntity);
productEntity.setSport(sportEntity);
productEntity = productRepository.save(productEntity);
AddSizeToProductRequestDto requestDto = addSizeToProductRequestDtoFactory.createAddSizeToRequestDto(productEntity.getId(), createProductRequestDTO.getProductSizeDtoList());
productEntity = productSizeService.addSizeToProduct(requestDto);
return modelMapper.map(productEntity, ProductResponseDto.class);
}
單元測驗類：
public class ProductCrudServiceImplTest {
ModelMapper modelMapper;
ProductCrudServiceImpl productCrudServiceImpl;
GenderCrudService genderCrudService;
SportCrudService sportCrudService;
CategoryCrudService categoryCrudService;
ProductRepository productRepository;
TechnologyService technologyService;
ProductSizeService productSizeService;
CreateProductRequestDto createProductRequestDTO;
List<Long> categoryIds;
List<Long> technologyIds;
GenderEntity genderEntity;
SportEntity sportEntity;
List<CategoryEntity> categoryEntities;
List<TechnologyEntity> technologyEntities;
Set<TechnologyEntity> technologyEntitiesSet;
Set<CategoryEntity> categoryEntitiesSet;
List<ProductSizeDto> productSizeDtoList;
ProductEntity initProduct;
ProductEntity expectedProduct;
AddSizeToProductRequestDto addSizeToProductRequestDto;
AddSizeToProductRequestDtoFactory addSizeToProductRequestDtoFactory;
ProductResponseDto resultProductDto;
@BeforeEach
public void beforeEach() {
modelMapper = mock(ModelMapper.class);
genderCrudService = mock(GenderCrudService.class);
sportCrudService = mock(SportCrudService.class);
categoryCrudService = mock(CategoryCrudService.class);
productRepository = mock(ProductRepository.class);
technologyService = mock(TechnologyService.class);
productSizeService = mock(ProductSizeService.class);
addSizeToProductRequestDto = mock(AddSizeToProductRequestDto.class);
addSizeToProductRequestDtoFactory = mock(AddSizeToProductRequestDtoFactory.class);
productCrudServiceImpl = new ProductCrudServiceImpl(
modelMapper,
genderCrudService,
sportCrudService,
categoryCrudService,
productRepository,
technologyService,
productSizeService,
addSizeToProductRequestDtoFactory
);
createProductRequestDTO = mock(CreateProductRequestDto.class);
genderEntity = mock(GenderEntity.class);
sportEntity = mock(SportEntity.class);
categoryIds = mock(List.class);
technologyIds = mock(List.class);
categoryEntities = Arrays.asList(CategoryEntity.builder().id(1L).name("category").description("description").build());
categoryEntitiesSet = categoryEntities.stream().collect(Collectors.toSet());
technologyEntities = Arrays.asList(TechnologyEntity.builder().id(1L).name("technology").description("description").build());
technologyEntitiesSet = technologyEntities.stream().collect(Collectors.toSet());
expectedProduct = ProductEntity.builder()
.id(1L)
.name("product")
.price(1)
.year(2022)
.thumbnail("thumbnail")
.sport(sportEntity)
.gender(genderEntity)
.technologies(technologyEntitiesSet)
.categories(categoryEntitiesSet)
.description("description")
.build();
productSizeDtoList = mock(List.class);
addSizeToProductRequestDto = mock(AddSizeToProductRequestDto.class);
addSizeToProductRequestDtoFactory = mock(AddSizeToProductRequestDtoFactory.class);
resultProductDto = mock(ProductResponseDto.class);
when(createProductRequestDTO.getGenderId()).thenReturn(1L);
when(createProductRequestDTO.getSportId()).thenReturn(2L);
when(createProductRequestDTO.getCategoryIds()).thenReturn(categoryIds);
when(createProductRequestDTO.getTechnologyIds()).thenReturn(technologyIds);
when(genderCrudService.findById(1L)).thenReturn(genderEntity);
when(sportCrudService.findById(1L)).thenReturn(sportEntity);
when(categoryCrudService.findByIds(categoryIds)).thenReturn(categoryEntities);
when(technologyService.findByIds(technologyIds)).thenReturn(technologyEntities);
when(modelMapper.map(createProductRequestDTO, ProductEntity.class)).thenReturn(expectedProduct);
when(productRepository.save(any())).thenReturn(expectedProduct);
when(createProductRequestDTO.getProductSizeDtoList()).thenReturn(productSizeDtoList);
when(addSizeToProductRequestDtoFactory.createAddSizeToRequestDto(1L, productSizeDtoList)).thenReturn(addSizeToProductRequestDto);
when(productSizeService.addSizeToProduct(addSizeToProductRequestDto)).thenReturn(expectedProduct);
when(modelMapper.map(any(), ArgumentMatchers.<Class<ProductResponseDto>>any())).thenReturn(resultProductDto);
}
@Test
public void createProduct_ShouldReturnProductResponseDto() {
ProductResponseDto result = productCrudServiceImpl.createProduct(createProductRequestDTO);
ArgumentCaptor<ProductEntity> productCaptor = ArgumentCaptor.forClass(ProductEntity.class);
verify(productRepository).save(productCaptor.capture());
ProductEntity savedProduct = productCaptor.getValue();
verify(modelMapper).map(productCaptor.capture(), ProductEntity.class);
ProductEntity mappedProduct = productCaptor.getValue();
//
assertEquals(savedProduct, expectedProduct);
assertEquals(mappedProduct, expectedProduct);
assertThat(result, is(resultProductDto));
}
我對此進行了一些研究，但我無法確定根本原因，我也不知道這是怎么發生的。你能幫我解決這個問題嗎？
非常感謝您寶貴的時間。
uj5u.com熱心網友回復：
beforeEach您方法中的最后一個模擬when(modelMapper.map(any(), ArgumentMatchers.<Class<ProductResponseDto>>any())).thenReturn(resultProductDto);似乎導致了這個問題。
如堆疊跟蹤所示，模擬存根回傳的物件是 type class com.example.demo.dto.responses.product.ProductResponseDto$MockitoMock$737533970。resultProductDto = mock(ProductResponseDto.class);您可以通過檢查哈希碼
來驗證它與創建的物件是否相同。
作為修復，為了模擬 的行為modelMapper.map(productEntity, ProductResponseDto.class);，您應該嘗試使用when(modelMapper.map(any(ProductEntity.class)...
uj5u.com熱心網友回復：
對于spring-boot中ModelMapper相關的junit測驗，或許可以參考一下答案：
如何在 Spring 中模擬 ModelMapper？
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