Angular.js promise not resolving when unit testing service with karma

Question

I am trying to unit test an Angular.js service, and need to set an expect on a promise returned from a Mock service (using Jasmine). I am using the karma unit testing framew

Answer 1

beforeEach(function(){
   var self=this;
    inject(function($rootScope,Facebook){
        self.$rootScope=$rootScope;
        self.Facebook=Facebook;
    });
})

it('resolves unless sourcecode broken',function(done){
    // I can't figure out how to do the equivalent of a $scope.$digest here. 
    var loginStatusPromise = this.FacebookService.getFacebookToken();
    loginStatusPromise.then(function(token) {
        expect(token).toBe('ValidToken');
        done();
    });
    $rootscope.$apply();

});

https://docs.angularjs.org/api/ng/service/$q