Test a Controller Service Call in AngularJS

I have a problem with the following situation:

I have a Controller that does a service call to get the different available languages and their greetings. And I would like to test this controller, I have based the test I've written from the following site and articles:

http://ift.tt/1zVMo7i

Angular unit-test controllers - mocking service inside controller

http://ift.tt/1DjLQOu

and ofcourse AngularJs documentations

But I have a feeling that i am doing some things wrong or overdoing my tests.

In the ones i have writted, the first 3 pass, but the 4th one (in my eyes the most important one) fail.

Could someone be so kind to help me out or point me in the right direction. It seems like every article i read say something different on what and how to test.

Controller

angular.module('app')
.controller('MainCtrl', function ($scope, LanguagesService) {
    $scope.languages = LanguagesService.getAll();
});

Service

angular.module('app')
  .factory('LanguagesService', function () {
   var lang = {};

   lang.greetings = [
      'Welkom bij,',
      'Bienvenu chez'
   ];

   lang.languages = [
     {
       name: 'Nederlands',
       code: 'nl'
     },
     {
       name: 'Français',
       code: 'fr'
     }
   ];

   return {
     getAll: function () {
        return lang;
     }
   };

});

My unit test for the controller

describe('Controller: MainCtrl', function () {

// load the controller's module
beforeEach(module('app'));

var MainCtrl,
      scope,
      LanguagesService;

// Initialize the controller and a mock scope
beforeEach(inject(function ($controller, $rootScope, _LanguagesService_) {
  scope = $rootScope.$new();
  LanguagesService = _LanguagesService_;
  MainCtrl = $controller('MainCtrl', {
    $scope: scope,
    'LanguagesService': LanguagesService
  });
  spyOn(LanguagesService, 'getAll');
}));

it('should get an instance of LanguagesService', function() {
  expect(LanguagesService).toBeDefined();
});

it('should attach languages to the scope', function() {
  expect(scope.languages).not.toBe(null);
});

it('should have the same amount of languages as greetings', function() {
  expect(scope.languages.languages.length).toBe(scope.languages.greetings.length);
});

it('should have called LanguagesService method getAll', function() {
  expect(LanguagesService.getAll).toHaveBeenCalled();
});

});

Thanks in advance !