Mock Mvc unit test throws Http 406 - spring-boot

Question

My controller has this code
#RequestMapping(value = "/getUserByEmailId/{emailId}", method = GET, produces = "application/json")
public ResponseEntity<UserRegistrationResponse> getUserByEmailId(#PathVariable String emailId) throws ServiceException {
return new ResponseEntity(generateUserOutput(userService.findUserByEmail(emailId)), OK);
}
My test has this:
#Test
public void testGetUserByEmailId() throws Exception {
when(userService.findUserByEmail(any())).thenReturn(userOutput);
MvcResult mvcResult = performGet("/user/getUserByEmailId/{emailId}", userRegistrationRequest.getEmail());
assertEquals(200, mvcResult.getResponse().getStatus());
}
private MvcResult performGet(String path, String pathVariable) throws Exception {
return mockMvc.perform(get(path,pathVariable)
.accept(APPLICATION_JSON))
.andDo(print())
.andReturn();
}
This is returning HTTP status code 406.
MockHttpServletRequest:
HTTP Method = GET
Request URI = /user/getUserByEmailId/testEmailId#test.com
Parameters = {}
Headers = {Accept=[application/json]}
Body = <no character encoding set>
Session Attrs = {}
Handler:
Type = com.nz.unicorn.web.controller.UserController
Method = public org.springframework.http.ResponseEntity<com.nz.unicorn.web.response.UserRegistrationResponse> com.nz.unicorn.web.controller.UserController.getUserByEmailId(java.lang.String) throws com.nz.unicorn.service.exception.ServiceException
Async:
Async started = false
Async result = null
Resolved Exception:
Type = org.springframework.web.HttpMediaTypeNotAcceptableException
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 406
Error message = null
Headers = {}
Content type = null
Body =
Forwarded URL = null
Redirected URL = null
Cookies = []
Is there anything I can do? I have seen a lot of questions without an answer that I can use. Do note, mine is not a spring test, it's a unit test.

Answer 1

This is a workaround I did, changed the controller as follows and it works:
#RequestMapping(value = "/getByEmailId/{emailId}", method = RequestMethod.GET, produces = "application/json")
#ResponseStatus(OK)
public UserRegistrationResponse getUserByEmailId(#PathVariable String emailId) throws ServiceException {
return generateUserOutput(userService.findUserByEmail(emailId));
}
This solved, don't know why ResponseEntity still didn't work though.