scala - Mocked service class is not working as expected while testing controller with Guice -

i have controller uses dependency injection , looks that:

class formfieldvalues @inject() (ffvaluesrepo : formfieldvaluerepository) extends controller classlogger {      /**       * gets formfieldvalue obejct checllist revision id       *       * @param revid       * @return       */     def getall(revid: muid) = action { implicit request =>         db.withtransaction { implicit connection =>             logger.info("injected repo: " + ffvaluesrepo)              val values = ffvaluesrepo.getallforchecklistrevision(revid)              logger.info("values: " + values)             // forse json             ok(json.tojson(values)).as("application/json")         }     } } 

the actual execution of controller works expected. however, when trying build test with mocked repository, mocking not seem picking properly.

this current test:

class formfieldvaluesspec extends specification mockito{      lazy val mockffvaluerepo = mock[formfieldvaluerepository]     implicit val connection = mock[connection]      val mockedservicesapp = new guiceapplicationbuilder()         .overrides(bind[formfieldvaluerepository].toinstance(mockffvaluerepo))         .build()      "formfieldvalues#getall" should {         "return json object relevant list of field values checklist revision id" in new withapplication(mockedservicesapp) {             // lets try empty list first             val emptylist = list()              doreturn(emptylist).when(mockffvaluerepo).getallforchecklistrevision(muid.fromstring("r5r3m4mwqzvakjcsikfjfg").get)              val some(result) = route(fakerequest(get, "/1/checklist-revisions/r5r3m4mwqzvakjcsikfjfg/form-field-values"))              status(result) must equalto(ok)         }     } } 

in logs see this:

2016-01-15 20:34:50,450 info c.w.formfieldvalues - injected repo: mock formfieldvaluerepository, hashcode: 1337346192 2016-01-15 20:34:50,463 info c.w.formfieldvalues - values: null

which means object injected correctly, reason instead of returning per stub (empty list), return null.

update after digging around got work replacing mock spy:

val mockffvaluerepo = spy(new anormformfieldvaluerepository()) implicit val connection = mock[connection] 

so looks mock didn't work... how can work proper mock?

what doing wrong?

thanks,