Spring's MockMvc perform patch

How can I perform patch with Spring's MockMvc? I tried with following code:

  @Test
    public void should_patch_success() throws Exception{
        mockMvc.perform(
                    request(HttpMethod.PATCH, "/Some/1")
                    .content(convertObjectToJson(new User()))
                    .contentType(MediaType
                                    .parseMediaType("application/json;charset=UTF-8")))
                    .andExpect(status().isOk());
        }

I'm sure that method convertObjectToJson works and MediaType is set correctly but it returns:

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Invalid use of argument matchers!
2 matchers expected, 1 recorded.