MockMVC how to test exception and response code in the same test case

问题

I want to assert that an exception is raised and that the server returns an 500 internal server error.

To highlight the intent a code snippet is provided:

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

Of course it dosen't matter if I write isInternalServerError or isOk. The test will pass regardless if an exception is thrown below the throw.except statement.

How would you go about to solve this?

回答1:

You can try something as below -

Create a custom matcher

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);

}
}

Declare a @Rule in JUnit class as below -

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

Use the Custom matcher in test case as -

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());

P.S.: I have provided a generic pseudo code which you can customize as per your requirement.

回答2:

You can get a reference to the MvcResult and the possibly resolved exception and check with general junit assertions...

          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))));

回答3:

In your controller:

throw new Exception("Athlete with same username already exists...");

In your test:

    try {
        mockMvc.perform(post("/api/athlete").contentType(contentType).
                content(TestUtil.convertObjectToJsonBytes(wAthleteFTP)))
                .andExpect(status().isInternalServerError())
                .andExpect(content().string("Athlete with same username already exists..."))
                .andDo(print());
    } catch (Exception e){
        //sink it
    }

来源：https://stackoverflow.com/questions/16605811/mockmvc-how-to-test-exception-and-response-code-in-the-same-test-case

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java

Spring

testing

spring-mvc

junit