[Unit Testing] Angular Unit Testing, ui-router, httpbackend and spy

// backend test
 
        beforeEach(inject(function (_$compile_, _$httpBackend_, _$rootScope_, _$state_, _AnnouncementsService_, _CONFIG_) {
            compile = _$compile_;
            $httpBackend = _$httpBackend_;
            $scope = _$rootScope_.$new();
 
            AnnouncementsService = _AnnouncementsService_;
            CONFIG = _CONFIG_;
 
            // Need to mock $state, so the ui-router resolve wont conflict with tests.
            state = _$state_;
            spyOn( state, 'go');
            spyOn( state, 'transitionTo');
 
            directiveElem = getCompiledElement();
            directiveCtrl = directiveElem.controller('comAnnouncements');
        }));
 
        afterEach(function() {
            $httpBackend.verifyNoOutstandingExpectation();
            $httpBackend.verifyNoOutstandingRequest();
        });
 
        it('should respond 200 to a http get request and get 1 announcement', function(){
            AnnouncementsService.getAnnouncementData(2);
 
            let expectedResponse = [
                {
                    "id": 0,
                    "title": "Maintenance work may affect Internet services 20/09/2015",
                    "date": "11 Nov 2015 | 12:30 PM"
                }
            ];
 
            $httpBackend.expectGET(CONFIG.BACKEND_API_URL + '/announcements/2').respond(200, { 'announcements': expectedResponse });
            $httpBackend.flush();
            expect(AnnouncementsService.announcementData).toEqual(expectedResponse);
        });
 
// ui-router test
 
        it('Should move to "home state"', () => {
            $scope.$apply(() => {
                angular.element(directiveElem.find('a')[0]).click();
                $timeout.flush();
            });
 
            expect($state.current.name).toEqual('selfcare.home');
        });
 
        it('$state href should equal "/home"', () => {
            $scope.$apply(() => {
                $state.go('selfcare.home');
            });
            expect($state.current.name).toEqual('selfcare.home');
            expect($state.href('selfcare.home')).toEqual('/home');
        });    
 
// Click to expect function to be called
 
        it('should call goToSearch()', function(){
            spyOn(directiveCtrl, 'goToSearch');
            angular.element(directiveElem.find('.header-icon-menu i')[0]).click();
            expect(directiveCtrl.goToSearch).toHaveBeenCalled();
        });