java.lang.AssertionError: Status expected:<200> but was:<405>

Question

I have a method located in class marked as @Controller

@RequestMapping(value = "/addEvent", method = RequestMethod.POST)
    public String addEvent(Model model,
            @Valid @ModelAttribute("myEvent") Event event,
            BindingResult result, RedirectAttributes redirectAttributes,
            @RequestParam(required = true) Integer selectedEventTypeId,
            @RequestParam(required = true) Integer selectedEventStatusId) {

        if (result.getErrorCount() > 1 ){
            return "eventDetailsAdd";
        }
        eventService.addEvent(event, selectedEventTypeId, selectedEventStatusId);
        redirectAttributes.addAttribute("idEvent", event.getId());
        redirectAttributes.addAttribute("message", "added correctly at " + new Date() );
        return "redirect:eventDetails";
    }

If I write following code:

MockHttpServletRequestBuilder request = MockMvcRequestBuilders
                .get("/addEvent");
        ResultActions result = mockMvc.perform(request);

        result.andExpect(MockMvcResultMatchers.status().isOk());

I see:

java.lang.AssertionError: Status expected:<200> but was:<405>
    at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:60)
    at org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:89)
    at org.springframework.test.web.servlet.result.StatusResultMatchers$5.match(StatusResultMatchers.java:549)
    ...

What's the problem, and how would I fix it?

UPDATE

if I write:

MockHttpServletRequestBuilder request = MockMvcRequestBuilders
                .get("/addEvent");
        request.param("selectedEventTypeId", "1");
        request.param("selectedEventStatusId", "1");

        ResultActions result = mockMvc.perform(request);

        result.andExpect(MockMvcResultMatchers.status().isOk());
        result.andExpect(MockMvcResultMatchers.forwardedUrl("eventDetailsAdd"));

I see the same result.

RESOLVED

Bitman advice + add(by Sotirios Delimanolis)

   request.param("selectedEventTypeId", "1");
   request.param("selectedEventStatusId", "1");

What will the Event event instance take from Spring in my case?

Answer 1

Change this

MockHttpServletRequestBuilder request = MockMvcRequestBuilders
            .get("/addEvent");

to

MockHttpServletRequestBuilder request = MockMvcRequestBuilders
                .post("/addEvent");

Because you're expecting method = RequestMethod.POST POST in controller But your test is executing GET.

This is what HTTP Error 405 Method not allowed means