public class RestControllerTest {

    //It is used in restController
    @Mock
    protected Service service;

    @InjectMocks
    protected RestController restController;


    @Test
    protected void testMe() throws Exception {
        MockMvc mockMVC =  MockMvcBuilders.standaloneSetup(restController)            .build();
        doThrow(new IOException()).when(service).methodCalled();


        mockMvc.perform(post("/something")
                .param("val", "test"))
                .andExpect(status().isBadRequest());
    }

}

@ControllerAdvice
public class MyControllerAdvice {

    @ResponseStatus(value = HttpStatus.CONFLICT)
    // 409
    @ExceptionHandler(IOException.class)
    public void ioException(final IOException e) {
        log.error("Request raised an IOException", e);
    }
}

@ResponseStatus(HttpStatus.BAD_REQUEST)
public class MyException extends RuntimeException {}

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Method is required