Spring boot application fails on mockmvc test -

i have simple controller test looks this

@runwith(springjunit4classrunner.class) @springapplicationconfiguration(classes = cuponzaapiapplication.class) @webappconfiguration public class usercontrollertest {  private mockmvc mockmvc;  @autowired protected webapplicationcontext wac;  @autowired userrepository userrepository;  @before public void setup(){     mockmvc = mockmvcbuilders.webappcontextsetup(wac).build();  }  @test public void createuser() throws exception{     cuponzauser user = new cuponzauser("some@test.com", "firstname", "lastname");     objectwriter jackson = new objectmapper().writer().withdefaultprettyprinter();      mockmvc.perform(post("/user/add").content(jackson.writevalueasstring(user)).contenttype(mediatype.application_json))              .anddo(print())              .andexpect(status().isok())              .andexpect(content().contenttype("application/json"));  } 

however fails saying following java.lang.assertionerror: content type not set

here controller

@restcontroller public class usercontroller {  @autowired userrepository userrepository;  @requestmapping(value = "/user/add",method = requestmethod.post,produces={mediatype.application_json_value}) public void adduser(@requestbody cuponzauser user, httpservletresponse response){       if(user ==null){         response.setstatus(httpstatus.bad_request.value());         return;     }else{         user.setcreationdate(new date());         user.setlastseendate(new date());         userrepository.save(user);         //response.addheader("content-type", mediatype.application_json_value);         return;     }  } 

i dont want manually add content type header each response , , thought "produces" annotation should take care of this

any ideas?

the issue you're not returning anything. response body empty.

in way makes sense, there no content, point in defining content-type? setting accept header won't anywhere. furthermore, should able reproduce same behaviour outside of unit tests too, i.e. it's not issue unit test/mock setup.

you either:

1. return content
2. consider returning 204 (no content), if don't want return (still wouldn't give content-type header make clear there no content)
3. add header manually in workaround commented out in question