java - ModelMapper JUnit Mockito 抛出 NullPointerException
问题描述
我正在尝试在服务类中测试一个方法,该方法使用 ModelMapper 将实体转换为 dto,但我在mapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
服务类的这一行得到 NullPointerException。
例外
java.lang.NullPointerException
at pro.budthapa.service.impl.StockCategoryServiceImpl.getStockCategoryByIdAndBusinessGroupId(StockCategoryServiceImpl.java:56)
at pro.budthapa.service.impl.StockCategoryServiceImplTest.WhenCategoryPresent_ShouldReturnCategory(StockCategoryServiceImplTest.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
测试班
@RunWith(MockitoJUnitRunner.class)
public class StockCategoryServiceImplTest {
@Mock
private ModelMapper mapper;
@Mock
private StockCategoryRepository stockCategoryRepository;
@InjectMocks
private StockCategoryServiceImpl stockCategoryService;
@Before
public void setup() {
mapper = new ModelMapper();
}
@Test
public void WhenCategoryPresent_ShouldReturnCategory() throws Exception {
int bgId = 10;
int categoryId = 5;
StockCategory sc = new StockCategory();
sc.setCategoryId(categoryId);
sc.setBusinessGroupId(String.valueOf(bgId));
sc.setDescription("Test Item");
Mockito.when(stockCategoryRepository.findByCategoryIdAndBusinessGroupId(categoryId, String.valueOf(bgId))).thenReturn(Optional.of(sc));
StockCategoryDto result = stockCategoryService.getStockCategoryByIdAndBusinessGroupId(categoryId, bgId);
assertEquals(5, result.getCategoryId() );
assertEquals(10, result.getBusinessGroupId());
assertNotNull(result.getDescription());
Mockito.verify(stockCategoryRepository, Mockito.times(1)).findByCategoryIdAndBusinessGroupId(categoryId, String.valueOf(bgId));
}
}
服务等级
@Service
public class StockCategoryServiceImpl implements StockCategoryService {
private ModelMapper mapper;
private StockCategoryRepository stockCategoryRepository;
public StockCategoryServiceImpl(ModelMapper mapper, StockCategoryRepository stockCategoryRepository) {
this.mapper = mapper;
this.stockCategoryRepository = stockCategoryRepository;
}
@Override
public StockCategoryDto getStockCategoryByIdAndBusinessGroupId(int categoryId, int bgId) {
Optional<StockCategory> cat = stockCategoryRepository.findByCategoryIdAndBusinessGroupId(categoryId, String.valueOf(bgId));
if(cat.isPresent()) {
//getting NullPointerException at this line
mapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
return mapper.map(cat.get(), StockCategoryDto.class);
}
StockCategoryDto dto = new StockCategoryDto();
dto.setMessage("Category not found for given id: "+categoryId);
return dto;
}
}
解决方案
你不应该重新分配你的模拟ModelMapper
方法setup
。删除此方法
而且我在您的代码模拟定义中找不到mapper.getConfiguration()
when(mapper.getConfiguration()).thenReturn(...)
你应该告诉它模仿。
推荐阅读
- java - 无法加载 javaFX 图像
- c++ - 类运算符
- sql - 从 Sybase 检索文件
- python - 有没有办法用 Pillow 绘制渐变颜色的文本?
- node.js - 使用 Promise.prototype.catch.apply(this, ...) :为什么一个未处理的 Promise 拒绝?
- xml - XSLT 循环返回相同的值
- c# - 有没有办法使用 Automapper 进行映射
- c# - 多个线程访问字符串列表,每次访问时移动的指针
- ms-word - 使用 SAS DDE 将 Word 文件另存为 DOCX
- reactjs - Antd UI Table:动态添加/删除列