angularjs - Errors thrown when unit testing directive with Angular -

i have custom directive uses service. when run unit tests, keep getting thrown error 'library not exist on window'. how can avoid getting error in unit test?

example service

angular.module('example')   .factory('thirdparty', ['$window', function($window) {      if (typeof $window.thirdparty === 'undefined') {       throw new error('library not exist on window');     } else {       return $window.thirdparty;     }    }]); 

custom directive

 angular.module('example')   .directive('customdirective', ['thirdparty',     function(thirdparty) {       var defaults, link;        link = function(scope, element, attrs, ctrls) {         // thirdparty       };        return {         restrict: 'a',         require: 'ngmodel',         link: link,       };     }]); 

test

describe('customdirective', function() {   var element, compile, scope;    beforeeach(module('example'));    beforeeach(inject(function($compile, $rootscope) {     compile = $compile;     scope = $rootscope.$new();   }));      // manually compile , link our directive   function getcompiledelement(template) {     var compiledelement;      var validtemplate = '<input ng-model="example.data" custom-directive />';      compiledelement = compile(template || validtemplate)(scope);     scope.$digest();      return compiledelement;   }    it('should something', function() {     element = getcompiledelement();     // expects   });  }); 

you need inject $window (stub out too, measure) , stub/mock out thirdparty lib.

var $window;  beforeeach(function () {   $window = {};    module('yourmodule', function ($provide) {     $provide.value('$window', $window);   });    $window.thirdparty = {}; }); 

---

it('throws', function () {   delete $window.thirdparty;    function fn () {     getcompiledelement();   }      expect(fn).to.throw(/does not exist on window/i); });  it('just works™', function () {   function fn () {     getcompiledelement();   }    expect(fn).to.not.throw; });