angularjs - $scope.$on is undefined in unit test -

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i'm unit testing initialization part of controller , can't seem on $scope.$on undefined error. know how write unit test in case or how test $scope.$on(). have failed find official angular documentation testing this.

var sidebarcontroller = function ($rootscope, $scope, $window, $location, personservice, searchservice) {     $scope.navname = 'filters'     $scope.currentfilter = null;     $scope.filterresult = null;     $scope.showfilters = true;     $rootscope.subtabs = null;      $scope.$on('userdataloaded', function () {         //doing stuff here     });     //... more stuff here }  sidebarcontroller.$inject = ['$rootscope', '$scope', '$window', '$location', 'personservice', 'searchservice'];

and test is:

    beforeeach(inject(function (_$controller_, _$rootscope_, _$window_, _$location_, _$httpbackend_, _personservice_, _searchservice_) {     $controller = _$controller_;     scope = _$rootscope_.$new();     rootscope = _$rootscope_;     location = _$location_;     $httpbackend = _$httpbackend_;     mockwindow = _$window_;     mockpersonservice = _personservice_;     mocksearchservice = _searchservice_;     rootscope.userinfo = { tabs: [] };     scope.$on = function (event, callback) { };     scope.$digest(); }));  aftereach(function () {     $httpbackend.verifynooutstandingexpectation();     $httpbackend.verifynooutstandingrequest(); });  it('should set  initial data', function () {     $controller('sidebarcontroller', { $rootscope: rootscope, $scope: scope, personservice: mockpersonservice });      rootscope.$broadcast('userdataloaded');      expect(scope).tobedefined();     expect(scope.navname).toequal('filters');     expect(scope.currentfilter).tobe(null);     expect(scope.filterresult).tobe(null);     expect(scope.showfilters).tobe(true);     expect(rootscope.subtabs).tobe(null); });

from understand correct way broadcast event , not spyon $scope.$on function itself.

the issue $broadcast functionality. unit test wrote did not handle $broadcast well.

what did this:

spyon(scope, '$broadcast').and.callthrough(); rootscope.$broadcast('userdataloaded', true);

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