POST: Exception Status expected: but was:

Technically it should be a simple task, but I can’t find the error.

I want to write a normal “POST method”, but when I tested it, it came to a problem: enter code here Status expected:<201> but what:<200>.

My question is, why do I get an OK and not a CREATED?

CODE:

PostMapping in Controller

 @PostMapping
    public Optional<ADto> createA(@RequestBody ADto a){
        return Optional.ofNullable(a);
    }

Unit Test

@Test
    void verifyPostA() throws Exception {
        var a = new ADto(1L, "a");

        var aText = objectMapper.writeValueAsString(a);

        mockMvc.perform(
                        MockMvcRequestBuilders.post("/as")
                                .content(aText)
                                .contentType(MediaType.APPLICATION_JSON)
                )
                .andDo(print())
                .andExpect(status().isCreated())
                .andExpect(jsonPath("$.id").value("1"));
    }

Answer

Because for a controller method that executes successfully and does not return ResponseEntity , the default response code is 200.

To configure the response code for such case , you can simply annotate @ResponseStatus on that controller method :

@PostMapping
@ResponseStatus(HttpStatus.CREATED)
public Optional<ADto> createA(@RequestBody ADto a){
        return Optional.ofNullable(a);
 }