Question

我有一个控制器类，它是这样的：

@Controller
public class ExampleController
{
   @RequestMapping(value = "/samplePage")
   public ResponseEntity getSampleDetails()
   {

       SomeClass Obj = new SomeClass()
    try{
        response = Obj.getData();
        return new ResponseEntity<>(response,HttpStatus.Ok)
       }
    catch(IllegalArgumentException e)
      {
        return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
      }
   }
}

我想编写一个junit测试用例，在调用someClass.getData时测试非法的ArgumentException.Hence我使用Mockito抛出异常。

 @RunWith(PowerMockRunner.class)
    public class exampleControllerTest
    {
    @Mock
    private SomeClass someClass;
    @InjectMocks
    private ExampleController exampleController;
    @Before
    public void before()
        {
         exampleControllerMockMvc = MockMvcBuilders.standaloneSetup(exampleController).build();
        }

    @Test
    public void exampleControllerTest_IllegalArgumentException_throwsInternalException()
        exampleControllerMockMvc.perform(get("/samplePage")).andExpect(status().is5xxServerError);
     Mockito.doThrow(new IllegalArgumentException).when(someClass).getData()
    }

然而，当我运行代码时，我收到一条错误说明

预期响应状态值200的范围：SERVER_ERROR但是：SUCCESSFUL。

如何测试异常？

Answer 1

您的问题是您在实际调用被测单元（您的控制器）后正在设置模拟器。您应首先设置模拟并执行调用：

Mockito.doThrow(new IllegalArgumentException()).when(someClass).getData();
exampleControllerMockMvc.perform(get("/samplePage")).andExpect(status().is5xxServerError);

Answer 2

您的代码中存在多个问题。

您没有模仿构造函数调用SomeClass Obj = new SomeClass(); SomeClass字段@Mock覆盖它不能完成这项工作。此地点需要PowerMock
```
PowerMockito.whenNew(SomeClass.class).withNoArguments().thenReturn(someClass);
```
应该模拟特定方法getData()以抛出异常，但在执行完全测试请求之前
```
Mockito.doThrow(new IllegalArgumentException()).when(someClass).getData();
```
要让PowerMock增强课程，您需要课程级别@PrepareForTest(ExampleController.class)
按照惯例，类从大写字母开始命名，因此exampleControllerTest - ＆gt; ExampleControllerTest

把所有的东西放在一起

@RunWith(PowerMockRunner.class)
@PrepareForTest(ExampleController.class)
public class ExampleControllerTest
{
    private SomeClass someClass;
    private MockMvc exampleControllerMockMvc;

    @Before
    public void before() {
        someClass = Mockito.mock(SomeClass.class);
        PowerMockito.whenNew(SomeClass.class).withNoArguments().thenReturn(someClass);
        exampleControllerMockMvc = MockMvcBuilders.standaloneSetup(new ExampleController())
                                                  .build();
    }

    @Test
    public void exampleControllerTest_IllegalArgumentException_throwsInternalException() {
        Mockito.doThrow(new IllegalArgumentException).when(someClass).getData();
        exampleControllerMockMvc.perform(get("/samplePage"))
                                .andExpect(status().is5xxServerError);  
    }
}

希望它有所帮助！

控制器中的异常未在junit

2 个答案: