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

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))));

If you have an exception handler and you want to test for a specific exception, you could also assert that the instance is valid in the resolved exception.

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

You can try something as below -

1. Create a custom matcher

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

2. Declare a @Rule in JUnit class as below -

   @Rulepublic ExpectedException exception = ExpectedException.none();

3. 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.