AngularJS: Unit testing controller returns "TypeError: $scope.$watch is not a function" -

i want write simple test controller

• sets variable of scope id
• calls function triggers api call id on scope
• log result

    describe('the app', () => {        beforeeach(angular.mock.module('mymodule'));        var $controller;       var eid = 123456;        beforeeach(angular.mock.inject((_$controller_) => {           $controller = _$controller_;       }));         describe('directive', () => {           it('should load data api', () => {               var scope = {};               var controller = $controller('mycontroller', { $scope: scope });               scope.entityid = eid;               expect(scope.entityid).tobe(eid);                controller.load(); // api call using scope.entityid, load data scope               scope.$digest();               console.log("entities:", controller.entities); // data should loaded           });       });     }); 

my controller uses "controller as" syntax.

my test run karma , gives me following error:

typeerror: $scope.$watch not function | @ mycontroller.watchchanges

any hint in right direction appreciated!

you have created scope empty object, not correct. should create new instance of $rootscope. check out code example:

 describe('the app', () => {      beforeeach(angular.mock.module('mymodule'));      var $controller, $rootscope;     var eid = 123456;      beforeeach(angular.mock.inject((_$controller_, _$rootscope_) => {         $controller = _$controller_;         $rootscope = _$rootscope_;     }));       describe('directive', () => {         it('should load data api', () => {             var scope = $rootscope.$new();             var controller = $controller('mycontroller', { $scope: scope });             scope.entityid = eid;             expect(scope.entityid).tobe(eid);              controller.load(); // api call using scope.entityid, load data scope             scope.$digest();             console.log("entities:", controller.entities); // data should loaded         });     }); }); 

hope you!