How to write unit testing scenario for creating and getting the data for angularjs code

I am new to unit testing ,i need to write unit test scenario for creating task and getting task by giving certain number

This is my routes

state('faqs.summary', {
      url: '/summary',
      views: {
        'main-display': {
          templateUrl: 'views/summary.html',
          controller: 'summaryFaqsCtrl'
        }
      }
    }).
state('faqs.summary.create', {
      url: '/create/:id',

      views: {
        'child-display': {
          templateUrl: 'views/itemform.html',
          controller: 'createFaqCtrl'
        }
      }
    })

my controllers code is as follows

    var app = angular.module('faqAdminResourceApp');
    app.controller('createFaqCtrl', function ($scope, $state, FaqService, $stateParams, toasty, usSpinnerService) {
        $scope.createFaqItem = function () {
              console.log('Checking form value : ' + JSON.stringify($scope.faqSingle));
              var faq = new FaqService({
                'subject': this.faqSingle.subject,
                'text': this.faqSingle.text,
                'category': this.faqSingle.category,
                'internal': this.faqSingle.internal
              });
              faq.$save(function (response) {
                if (response.ErrMessage) {
                  $scope.error = response.ErrMessage;
                  toasty.pop.warning({
                    title: 'Subject already Exists !',
                    sound: false,
                    showClose: true,
                    clickToClose: false,
                    timeout: 3000
                  });
                } else {
                  toasty.pop.success({
                    title: 'Successfully added FAQ !',
                    sound: false,
                    showClose: true,
                    clickToClose: false,
                    timeout: 3000
                  });
                  $scope.faqSingle = '';
                  $scope.newFaq = false;
                  $state.go('faqs.summary');
                }
              }, function (errorResponse) {
                $scope.error = errorResponse.data.message;
              });
        }
    });

app.controller('summaryFaqsCtrl', function ($scope, $state, FaqService, faqSummaryService, $rootScope,usSpinnerService) {
$scope.getSummaryFaqs = function (summaryFaqDepth) {
        if ($state.current.name==='faqs.summary') {
            usSpinnerService.spin('spinner-1');
             }
    faqSummaryService.query({
      summaryDepth: summaryFaqDepth
    }, function (res) {
             $scope.faqSumItems = res;
             if ($state.current.name==='faqs.summary') {
            usSpinnerService.stop('spinner-1');
             }
    });
  };
});

And this is my services code

app.factory('FaqService', function ($resource, ConfigService) {

  // AngularJS will instantiate a singleton by calling "new" on this function
  return $resource(ConfigService.API_URL + 'faqs/:faqId', {
    faqId: '@faqId'
  }, {
    'get': {
      method: 'GET'
    },
    'save': {
      method: 'POST'
    },
    'update': {
      method: 'PUT'
    },
    'query': {
      method: 'GET',
      isArray: true
    },
    'remove': {
      method: 'DELETE'
    },
    'delete': {
      method: 'DELETE'
    }
  });
});

app.factory('faqSummaryService', function ($resource, ConfigService) {
  return $resource(ConfigService.API_URL + 'faqs/summary/:summaryDepth', {
    summaryDepth: '@summaryDepth'
  }, {
    'query': {
      method: 'GET',
      isArray: true
    }
  });
});

Here i tried to write unit test for create task.while exceuting the task it shows an error that scope.faqSingle.length is not defined.with out checking the length How i no wheather the task is creating are not. This is my following test code

test.js

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

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

    beforeEach(function() {
            jasmine.addMatchers({
                toEqualData: function(util, customEqualityTesters) {
                    return {
                        compare: function(actual, expected) {
                            return {
                                pass: angular.equals(actual, expected)
                            };
                        }
                    };
                }
            });
        });

  var createfaqCtrl,
    scope,$httpBackend;

  // Initialize the controller and a mock scope
  beforeEach(inject(function ($controller, $rootScope,_$httpBackend_) {
    scope = $rootScope.$new();
        $httpBackend = _$httpBackend_;
    createfaqCtrl = $controller('createFaqCtrl', {
      $scope: scope
    });
  }));


    it('Create a Faq item', inject(function(FaqService){
        scope.faqSingle = new FaqService({
          subject:'New Item',
            text:'A new item is created in db',
            category:'general',
            internal:true
        });
    var faqSingle=scope.faqSingle;  $httpBackend.whenPOST('http://localhost:5000/api/v1/faqs',scope.faqSingle).respond(200);
        scope.createFaqItem();
         expect(scope.createFaqItem).toBeTruthy();
       expect(scope.faqSingle.length).toBe(1);

    }));
});