MockMVC如何在同一测试用例中测试异常和响应代码

Question

我想声明引发异常并且服务器返回500内部服务器错误.

要突出显示意图,请提供代码段:

thrown.expect(NestedServletException.class);
this.mockMvc.perform(post("/account")
            .contentType(MediaType.APPLICATION_JSON)
            .content(requestString))
            .andExpect(status().isInternalServerError());

当然,无论我写作isInternalServerError还是写作都没关系isOk.无论是否在throw.except语句下方抛出异常,测试都将通过.

你会怎么解决这个问题？

Answer 1

您可以获得对MvcResult和可能已解决的异常的引用，并检查一般 JUnit 断言...

MvcResult result = this.mvc.perform(
        post("/api/some/endpoint")
                .contentType(TestUtil.APPLICATION_JSON_UTF8)
                .content(TestUtil.convertObjectToJsonBytes(someObject)))
        .andDo(print())
        .andExpect(status().is4xxClientError())
        .andReturn();

Optional<SomeException> someException = Optional.ofNullable((SomeException) result.getResolvedException());

someException.ifPresent( (se) -> assertThat(se, is(notNullValue())));
someException.ifPresent( (se) -> assertThat(se, is(instanceOf(SomeException.class))));

Answer 2

如果您有一个异常处理程序并且想要测试特定的异常，您还可以断言该实例在已解决的异常中有效。

.andExpect(result -> assertTrue(result.getResolvedException() instanceof WhateverException))

Answer 3

您可以尝试以下操作-

1. 创建一个自定义匹配器

   public class CustomExceptionMatcher extends
   TypeSafeMatcher<CustomException> {
   
   private String actual;
   private String expected;
   
   private CustomExceptionMatcher (String expected) {
       this.expected = expected;
   }
   
   public static CustomExceptionMatcher assertSomeThing(String expected) {
       return new CustomExceptionMatcher (expected);
   }
   
   @Override
   protected boolean matchesSafely(CustomException exception) {
       actual = exception.getSomeInformation();
       return actual.equals(expected);
   }
   
   @Override
   public void describeTo(Description desc) {
       desc.appendText("Actual =").appendValue(actual)
           .appendText(" Expected =").appendValue(
                   expected);
   
   }
   }
   

2. @Rule在JUnit类中声明如下：

   @Rule
   public ExpectedException exception = ExpectedException.none();
   

3. 在测试用例中将自定义匹配器用作-

   exception.expect(CustomException.class);
   exception.expect(CustomException
           .assertSomeThing("Some assertion text"));
   this.mockMvc.perform(post("/account")
       .contentType(MediaType.APPLICATION_JSON)
       .content(requestString))
       .andExpect(status().isInternalServerError());
   

PS：我提供了通用的伪代码，您可以根据自己的要求进行自定义。