java 为@ExceptionHandler 编写 JUnit 测试
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Write JUnit test for @ExceptionHandler
提问by John B
I am writing a Rest service using Spring MVC. Here is the outline of the class:
我正在使用 Spring MVC 编写一个 Rest 服务。以下是课程大纲：
@Controller
public class MyController{
@RequestMapping(..)
public void myMethod(...) throws NotAuthorizedException{...}
@ExceptionHandler(NotAuthorizedException.class)
@ResponseStatus(value=HttpStatus.UNAUTHORIZED, reason="blah")
public void handler(...){...}
}
I have written my unit tests using the design posted here. The test is basically as follows:
我已经使用此处发布的设计编写了我的单元测试。测试基本如下：
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(....)
public class mytest{
MockHttpServletRequest requestMock;
MockHttpServletResponse responseMock;
AnnotationMethodHandlerAdapter handlerAdapter;
@Before
public void setUp() {
requestMock = new MockHttpServletRequest();
requestMock.setContentType(MediaType.APPLICATION_JSON_VALUE);
requestMock.addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);
responseMock = new MockHttpServletResponse();
handlerAdapter = new AnnotationMethodHandlerAdapter();
}
@Test
public void testExceptionHandler(){
// setup ....
handlerAdapter.handle(...);
// verify
// I would like to do the following
assertThat(responseMock.getStatus(), is(HttpStatus.UNAUTHORIZED.value()));
}
}
However, the call to handleis throwing the NotAuthorizedException. I have read that this is by design to be able to unit test that the method throws the appropriate exception, however I would like to write an automated test that the framework is handling this exception appropriately and that the class under test has implemented the handler appropriately. Is there a way to do this?
但是，对 的调用handle正在抛出NotAuthorizedException. 我已经读到这是设计使能单元测试该方法抛出适当的异常，但是我想编写一个自动化测试，框架正在适当地处理这个异常，并且被测类已经适当地实现了处理程序. 有没有办法做到这一点？
Please be aware that I do not have access to the actual code in a place where I could post it.
请注意，我无法在可以发布的地方访问实际代码。
Also, I am limited (for unfortunate reasons) to Spring 3.0.5 or 3.1.2.
此外，我（出于不幸的原因）仅限于 Spring 3.0.5 或 3.1.2。
采纳答案by Boris Treukhov
Consider using Spring 3.2 and its mvc-test-framework
考虑使用 Spring 3.2 及其mvc-test-framework
import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration("file:src/main/webapp/WEB-INF/spring/appServlet/servlet-context.xml")
public class WebMvcTest {
@Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
@Before
public void setup() {
this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
}
@Test
public void getFoo() throws Exception {
this.mockMvc.perform(
get("/testx")
.contentType(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
)
.andExpect(status().isUnauthorized());
}
}
Controller code
控制器代码
@Controller
public class MyController {
public class MyException extends RuntimeException {
};
@RequestMapping("/testx")
public void myMethod() {
throw new MyException();
}
@ExceptionHandler(MyException.class)
@ResponseStatus(value = HttpStatus.UNAUTHORIZED, reason = "blah")
public void handler() {
System.out.println("handler processed");
}
}
This "test" passes well.
这个“测试”顺利通过。
Disclaimer: currently I'm a noob in Spring MVC testing, actually it's my first test.
upd: Thanks to The Drake for the correction.
免责声明：目前我是 Spring MVC 测试的菜鸟，实际上这是我的第一次测试。
upd：感谢德雷克的更正。
回答by Jonas Geiregat
Annotate your Exception Handling controller with @ControllerAdviceinstead of @Controller.
使用@ControllerAdvice而不是注释您的异常处理控制器@Controller。
As Boris Treukhov noted when adding the @ExceptionHandlerannotation to a method in the controller that throws the exception will make it work but only from that specific controller.
正如鲍里斯·特鲁霍夫 (Boris Treukhov) 所指出的，在将@ExceptionHandler注释添加到引发异常的控制器中的方法时，将使其工作，但仅限于该特定控制器。
@ControllerAdvicewill allow your exception handeling methods to be applicable for your whole application not just one specific controller.
@ControllerAdvice将允许您的异常处理方法适用于您的整个应用程序，而不仅仅是一个特定的控制器。
回答by Joe
You could change @Test to
您可以将@Test 更改为
@Test(expected=NotAuthorizedException.class)
This would return true if the internals throw up that exception and false otherwise.
如果内部抛出该异常，则返回 true，否则返回 false。
This would also make the assertThat() unnecessary. You could write a second test that catches the NotAuthorizedException then you could inspect the responseMock under that condition then.
这也会使 assertThat() 变得不必要。您可以编写第二个测试来捕获 NotAuthorizedException，然后您可以在该条件下检查 responseMock。
