javascript - AngularJS Karma Test Spec Promise not resolved and .then() not called -

i have problem angularjs karma unit testing service.

i have service service method this:

service.getintersectingelements = function (element, elements) {     var deferred = $q.defer();     var tolerance = 20;     var intersectingelements = [];     $timeout(function () {         (var = 0; < elements.length; i++) {             if (element.$$hashkey != elements[i].$$hashkey)                 if (service.checkintersection(element.location, elements[i].location, tolerance))                     intersectingelements.push(elements[i]);         }         if (intersectingelements.length > 0)             deferred.resolve(intersectingelements);         else             deferred.reject();     });      return deferred.promise; }; 

it works fine if called controller. want test method, returns promise resolved later. want value resolved , compare in unit test.

so wrote following karma test:

it('should intersecting elements', function () {     var element = {id: 1, name: 'water', location: {x: 200, y: 200}};     var elements = [{id: 2, name: 'fire', location: {x: 200, y: 200}}];      service.getintersectingelements(element, elements).then(function (result) {         expect(result).toequal([{id: 2, name: 'fire', location: {x: 200, y: 200}}]);     }); }); 

i call service method same in controller. test ends done ok. if change line

expect(result).toequal([{id: 2, name: 'fire', location: {x: 200, y: 200}}]); 

to

expect(result).toequal("test"); 

the test done , not failing. in case expect test fail.

i tried injecting $rootscope , calling $rootscope.$digest(); after service method call. should resolve previous promise, in fact did not take effect, if place digest or not...

so question is, how test promise returned service method , compare value resolved , passed then() of promise in karma unit test.

edit: i've tried $timeout.flush(); , $rootscope.$digest(); after service method call.

i injected services if helps:

var service; var $timeout; var $rootscope;  beforeeach(module('app')); beforeeach(module('app.services'));  beforeeach(angular.mock.inject(function (intersectservice, _$timeout_, _$rootscope_) {     service = intersectservice;     $timeout = _$timeout_;     $rootscope = _$rootscope_; })); 

ok fixed myself...

first... need flush timeout (which tried earlier) , need scope apply

it('should intersecting elements', function () {     var element = {id: 1, name: 'water', location: {x: 200, y: 200}, $$hashkey: "1"};     var elements = [         {id: 1, name: 'water', location: {x: 200, y: 200}, $$hashkey: "1"},         {id: 2, name: 'fire', location: {x: 200, y: 200}, $$hashkey: "2"}     ];      var promise = service.getintersectingelements(element, elements);      var result;     promise.then(function (res) {         result = res;     },     function (error) {         result = "error";     });      $rootscope.$apply();     $timeout.flush();      expect(result).toequal([{id: 2, name: 'fire', location: {x: 250, y: 200}, $$hashkey: "2"}]); }); 

the whole thing looks above.

but second... that's not true mistake. used $$hashkey property in service method (see above in question), (obviously) not set, because did not set in test data. $$hashkey exists if variable on $scope. didn't remember set it.

so answer set $$hashkey seen in code above.