Unit testing the AngularJS $window service - angularjs

Question

I would like to unit test the following AngularJs service:
.factory('httpResponseInterceptor', ['$q', '$location', '$window', 'CONTEXT_PATH', function($q, $location, $window, contextPath){
return {
response : function (response) {
//Will only be called for HTTP up to 300
return response;
},
responseError: function (rejection) {
if(rejection.status === 405 || rejection.status === 401) {
$window.location.href = contextPath + '/signin';
}
return $q.reject(rejection);
}
};
}]);
I have tried with the following suite:
describe('Controllers', function () {
var $scope, ctrl;
beforeEach(module('curriculumModule'));
beforeEach(module('curriculumControllerModule'));
beforeEach(module('curriculumServiceModule'));
beforeEach(module(function($provide) {
$provide.constant('CONTEXT_PATH', 'bignibou'); // override contextPath here
}));
describe('CreateCurriculumCtrl', function () {
var mockBackend, location, _window;
beforeEach(inject(function ($rootScope, $controller, $httpBackend, $location, $window) {
mockBackend = $httpBackend;
location = $location;
_window = $window;
$scope = $rootScope.$new();
ctrl = $controller('CreateCurriculumCtrl', {
$scope: $scope
});
}));
it('should redirect to /signin if 401 or 405', function () {
mockBackend.whenGET('bignibou/utils/findLanguagesByLanguageStartingWith.json?language=fran').respond([{"description":"Français","id":46,"version":0}]);
mockBackend.whenPOST('bignibou/curriculum/new').respond(function(method, url, data, headers){
return [401];
});
$scope.saveCurriculum();
mockBackend.flush();
expect(_window.location.href).toEqual("/bignibou/signin");
});
});
});
However, it fails with the following error message:
PhantomJS 1.9.2 (Linux) Controllers CreateCurriculumCtrl should redirect to /signin if 401 or 405 FAILED
Expected 'http://localhost:9876/context.html' to equal '/bignibou/signin'.
PhantomJS 1.9.2 (Linux) ERROR
Some of your tests did a full page reload!
I am not sure what is going wrong and why. Can anyone please help?
I just want to ensure the $window.location.href is equal to '/bignibou/signin'.
edit 1:
I managed to get it to work as follows (thanks to "dskh"):
beforeEach(module('config', function($provide){
$provide.value('$window', {location:{href:'dummy'}});
}));

Answer 1

You can inject stub dependencies when you load in your module:
angular.mock.module('curriculumModule', function($provide){
$provide.value('$window', {location:{href:'dummy'}});
});

Answer 2

To get this to work for me I had to make a minor adjustment. It would error out and say:
TypeError: 'undefined' is not an object (evaluating '$window.navigator.userAgent')
So I added the navigator.userAgent object to get it to work for me.
$provide.value('$window', {
location:{
href:'dummy'
},
navigator:{
userAgent:{}
}
});

Answer 3

I faced the same problem, and went a step further in my solution. I didn't just want a mock, I wanted to replace $window.location.href with a Jasmine spy for the better ability to track changes made to it. So, I learned from apsiller's example for spying on getters/setters and after creating my mock, I was able to spy on the property I wanted.
First, here's a suite that shows how I mocked $window, with a test to demonstrate that the spy works as expected:
describe("The Thing", function() {
var $window;
beforeEach(function() {
module("app", function ($provide) {
$provide.value("$window", {
//this creates a copy that we can edit later
location: angular.extend({}, window.location)
});
});
inject(function (_$window_) {
$window = _$window_;
});
});
it("should track calls to $window.location.href", function() {
var hrefSpy = spyOnProperty($window.location, 'href', 'set');
console.log($window.location.href);
$window.location.href = "https://www.google.com/";
console.log($window.location.href);
expect(hrefSpy).toHaveBeenCalled();
expect(hrefSpy).toHaveBeenCalledWith("https://www.google.com/");
});
});
As you can see above, the spy is generated by calling the below function: (it works for both get and set)
function spyOnProperty(obj, propertyName, accessType) {
var desc = Object.getOwnPropertyDescriptor(obj, propertyName);
if (desc.hasOwnProperty("value")) {
//property is a value, not a getter/setter - convert it
var value = desc.value;
desc = {
get: function() { return value; },
set: function(input) { value = input; }
}
}
var spy = jasmine.createSpy(propertyName, desc[accessType]).and.callThrough();
desc[accessType] = spy;
Object.defineProperty(obj, propertyName, desc);
return spy;
}
Lastly, here's a fiddle demonstrating this in action. I've tested this against Angular 1.4, and Jasmine 2.3 and 2.4.