Jasmine - Mocked method can't be found - javascript

In a Jasmine test I have the following:
CommentMock = function() {};
CommentMock.prototype.save = function() {
// stuff
};
spyOn( CommentMock.prototype, 'save' ).andCallThrough();
However, I'm getting this error:
Failure/Error: save() method does not exist
In an Angular controller I have this:
$scope.newComment = new Comment();
$scope.processComment = function( isValid ) {
if ( isValid ) {
Comment.save( $scope.newComment )
.$promise
.then(
function() {
// success stuff
},
function() {
// error junk
}
);
}
};

If Comment is a service I would mock it like this instead:
CommentMock = {}
CommentMock.save = function() {
// stuff
};
spyOn( CommentMock, 'save' ).andCallThrough();
But actually I wouldnt mock it like this at all. I would allow the service to be injected into the unit test and then intercept the service call using the spyOn method of jasmine.
var Comment, $rootScope, $controller; //... maybe more...
beforeEach(inject(function(_$rootScope_, _Comment_, _$controller_ //,... everything else) {
$controller = _$controller_;
$rootScope = _$rootScope_;
Comment = _Comment_;
}));
function setupController() {
spyOn(Comment, 'save').andCallThrough();
controller = $controller('YOURCONTROLLERSNAME', {
$scope: $scope,
Comment: Comment
}
}
Code is super simplified and wont work straight like this but its the overall idea...
Some other unit testing links I wrote:
Mocking Controller Instantiation In Angular Directive Unit Test
Unit testing in AngularJS - Mocking Services and Promises

Related

AngularJS tests - inject -> module -> inject

I'm trying to test a service documentViewer that depends on some other service authService
angular
.module('someModule')
.service('documentViewer', DocumentViewer);
/* #ngInject */
function DocumentViewer($q, authService) {
// ...
this.view = function(doc) {
//...
}
}
This is what my test looks like at the moment
it('test', inject(function($q) {
var doc = {
view: function() {
return $q.resolve(0);
}
};
var auth = {
refreshProfileData: function() {
return $q.resolve(0);
},
};
var viewer = createViewer(auth);
}));
function createViewer(auth) {
var viewer;
module({
authService: auth
});
inject(function(documentViewer) {
viewer = documentViewer;
});
return viewer;
}
The problem is I need to call inject to grab a $q, then use it to create my mocks, register my mocks with module, and then call inject again to grab the unit under test.
This results in
Error: Injector already created, can not register a module! in bower_components/angular-mocks/angular-mocks.js (line 2278)
I've seen lots of answers here on SO saying you can't call module after inject, but they don't offer any alternative to a scenario like the above.
What's the correct approach here?
PS: I'd like to avoid using beforeEach, I want each test to be self-contained.
module is used to define which modules will be loaded with inject and cannot be called after inject, this is chicken-egg situation.
The object accepted by module is used to define mocked services with $provide.value:
If an object literal is passed each key-value pair will be registered on the module via $provide.value, the key being the string name (or token) to associate with the value on the injector.
There can be no more than 1 function like createViewer that calls both module and inject. If this means that this kind of self-contained test is an antipattern, there is nothing that can be done about that. Angular testing works best with usual habits, including beforeEach and local variables.
In order to eliminate the dependency on $q, mocked service can be made a factory.
it('test', function () {
var authFactory = function ($q) {
return {
refreshProfileData: function() {
return $q.resolve(0);
},
};
};
// mocks defined first
module(function ($provide) {
$provide.factory('authService': authFactory);
});
var viewer;
inject(function(documentViewer) {
viewer = documentViewer;
});
// no module(...) is allowed after this point
var $q;
inject(function(_$q_) {
$q = _$q_;
});
var doc = {
view: function() {
return $q.resolve(0);
}
};
});

Karma error - Expected undefined to be defined

I want to unit test my controller. I started with basic test assertions of expect API. But I am facing challenge in mocking scope methods inside a conditional check. I am getting an undefined error since it is not available under scope, only the global logout() method is available.
I tried mocking the localStorageService using spyOn as true to satisfy the condition, but that's still of no help. Any solution will be of great help to get me kickstarted.
Controller:
angular.module('app').controller('sampleCtrl',
function($scope, $state, $http, $rootScope, localStorageService) {
if (!(localStorageService.get('isAuthenticated'))) {
$state.go('home');
}
if (localStorageService.get('isAuthenticated') === true) {
//http post calls made here to perform certain operation on page load
$scope.someMethod = function(){
//do something
}
}
$scope.logOut = function() {
localStorageService.set('property', '');
localStorageService.set('isAuthenticated', false);
$state.go('home');
};
});
Karma:
'use strict';
describe('Controller: sampleCtrl', function() {
/** to load the controller's module */
beforeEach(module('app'));
var sampleCtrl,scope,httpBackend,deferred,rootScope;
beforeEach(inject(function ($controller,_$rootScope_,$httpBackend,$q) {
var store = {};
scope= _$rootScope_.$new(); // creates a new child scope of $rootScope for each test case
rootScope = _$rootScope_;
localStorageService = _localStorageService_;
httpBackend = $httpBackend;
httpBackend.whenGET(/\.html$/).respond('');
spyOn(localStorageService, 'set').and.callFake(function (key,val) {
store[key]=val;
});
spyOn(localStorageService, 'get').and.callFake(function(key) {
return store[key];
});
sampleCtrl = $controller('sampleCtrl',{
_$rootScope_:rootScope,
$scope:scope,
$httpBackend:httpBackend,
_localStorageService_:localStorageService
// add mocks here
});
localStorageService.set('isAuthenticated',true);
}));
/**ensures $httpBackend doesn’t have any outstanding expectations or requests after each test*/
afterEach(function() {
httpBackend.verifyNoOutstandingExpectation();
httpBackend.verifyNoOutstandingRequest();
});
it('sampleCtrl to be defined:',function(){
httpBackend.flush();
expect(sampleCtrl).toBeDefined();
});
// failing test case - scope.someMethod not available in scope
it('is to ensure only authenticated user can access the state methods',function(){
localStorageService.get('isAuthenticated');
httpBackend.flush();
expect(scope.someMethod).toBeDefined();
});
});
I've managed to get it work.
The problem was that localStorageService did not have isAuthenticated set to true on starting the controller. Place setting it to true before calling the controller.

Angular - Testing http services with httpBackend throws unexpected exception

The module definition
var module = angular.module('test', []);
module.provider('client', function() {
this.$get = function($http) {
return {
foo: function() {
return $http.get('foo');
}
}
}
});
module.factory('service', ['client', function(client) {
return {
bar: function() {
return client.foo();
}
}
}]);
Basically, client is a wrapper for http calls, and service is a wrapper around the client basic features.
I'm unit testing both the provider and the service with karma+jasmine. The provider tests run as expected, but i have a problem with the service tests:
describe('service test', function(){
var service = null;
beforeEach(function(){
module('test')
inject(function(_service_, $httpBackend, $injector) {
service = _service_;
$httpBackend = $injector.get('$httpBackend');
});
});
it('should invoke client.foo via service.bar', function() {
$httpBackend.expect("GET", "foo");
service.bar();
expect($httpBackend.flush).not.toThrow();
});
});
I get Expected function not to throw, but it threw Error: No pending request to flush !.. When testing the provider with the same way, this test passes. Why?
When you are testing your service, you need to mock the client and inject that mock instead of the real client. Your mock can be in the same file if you only expect to use it for testing this service or in a separate file if you'll use it again elsewhere. Doing it this way does not require the use of $httpBackend (because you are not actually making an http call) but does require using a scope to resolve the promise.
The mock client:
angular.module('mocks.clientMock', [])
.factory('client', ['$q', function($q) {
var mock = {
foo: function() {
var defOjb = $q.defer();
defOjb.resolve({'your data':'1a'});
return defOjb.promise;
}
};
return mock;
}]);
Using the mock:
describe('service test', function(){
var service, mock, scope;
beforeEach(function(){
module('test', 'mocks.clientMock');
inject(function(_service_, $rootScope) {
service = _service_;
scope = $rootScope.$new();
});
});
it('should invoke client.foo via service.bar', function() {
spyOn(client, 'foo').and.callThrough();
service.bar();
scope.$digest();
expect(client.foo).toHaveBeenCalled();
});
});

Mocking custom provider injected into provider when unit testing Angular in Jasmine

I'm unit testing a provider in Jasmine, which relies on another provider. There's no configuration associated with this provider. When mocking a provider, I've read you're supposed to use something like
beforeEach(module(function ($provide) {
mockInjectedProvider = { };
$provide.value('injected', mockInjectedProvider );
}));
which works fine for me when injecting a custom provider into a service. When injecting them into a provider it doesn't work though. The code doesn't fail, but what gets executed when testing is the actual provider, not the mocked one. Abstracted example below.
var mockInjectedProvider;
beforeEach(function () {
module('myModule');
});
beforeEach(module(function ($provide) {
mockInjectedProvider = {
myFunc: function() {
return "testvalue"
}
}
};
$provide.value('injected', mockInjectedProvider );
}));
beforeEach(inject(function (_base_) {
baseProvider = _base_;
}));
it("injectedProvider should be mocked", function () {
var resultFromMockedProvider = baseProvider.executeMyFuncFromInjected();
expect(resultFromMockedProvider).toEqual("testvalue");
}); // Here instead of using my mock it executes the actual dependency
In the $provide.value statement I've tried including both injected and injectedProvider, as well as using $provide.provider and mocking a $get function on it but nothing seems to work. I just can't get it to mock away the actual provider. Abstracted base provider looks like this.
(function (ng, module) {
module.provider("base",
["injectedProvider", function (injectedProvider) {
this.executeMyFuncFromInjected= function() {
return injectedProvider.myFunc(); // let's say this returns "realvalue"
}
this.$get = function () {
return this;
};
}]
);
})(window.angular, window.angular.module("myModule"));
Everything in my code is working except the Jasmine mocking.
In this case is better to just mock the return value instead of the provider.
var mockInjectedProvider;
beforeEach(function () {
module('myModule');
});
beforeEach(inject(function (_injected_) {
spyOn(_injected_, "myFunc").and.returnValue("testvalue");
}));
beforeEach(inject(function (_base_) {
baseProvider = _base_;
}));
it("injectedProvider should be mocked", function () {
var resultFromMockedProvider = baseProvider.executeMyFuncFromInjected();
expect(resultFromMockedProvider).toEqual("testvalue");
}); // Here instead of using my mock it executes the actual dependency

Unit testing Angular with Breeze

I am trying to unit test angularjs with QUnit but get the error messages: $httpBackend.whenGET is not a function, $httpBackend.when is not a function. I have included angular mocks and angular breeze service (http://www.breezejs.com/documentation/breeze-angular-service) which uses the angular q library for promises and httpbackend instead of $.ajax for data transmission. I am still unable to mock any of the calls to the server. Some sample code:
var $httpBackend,
injector;
var SPAModule = angular.module("spa");
injector = angular.injector(['ng', 'spa']);
$httpBackend = injector.get("$httpBackend");
SPAModule.config(function ($provide) {
$provide.decorator('$httpBackend', angular.mock.e2e.$httpBackendDecorator);
});
test("WHEN the controller is called THEN it should be created with the correct data on the scope", function () {
'use strict';
// Given
$httpBackend.whenGET("/Breeze/Data/Jobs").respond({ data: jobData });
$httpBackend.whenGET("/Breeze/Data/Metadata").respond({});
var routeParams = { id: "b" },
// When
controller = injector.get('$controller')(toriga.propertyController, {
$scope: theScope,
$window: windowMock,
$location: locationMock,
$routeParams: routeParams
}),
$rootScope = injector.get('$rootScope');
$httpBackend.flush();
$rootScope.$apply(); // forces results of promise to be executed
// Then
notEqual(controller, null, 'controller was created properly');
strictEqual(theScope.pageTitle, "Property", "pageTitle was set on the scope");
notEqual(theScope.job, null, "Job set on the scope");
ok(toastrMock.warning.notCalled, "No warning messages were displayed");
ok(toastrMock.error.notCalled, "No error messages were displayed");
});
This code used to work fine when I was not using breeze but now I have switched I can't seem to get it to work and the documentation is poor on how to get this working. Any help would be appreciated.
I can't tell all of the details of your tests. I can offer some comfort that it does work .. and pretty much as you'd expect.
Here is an extract from the test/specs/lookups.spec in the "Zza-Node-Mongo" sample (it's in github) in which I replay through the $httpBackend mock a (subset of) the server’s response to a Breeze client request for "lookup" reference entities.
I'm using Jasmine instead of QUnit but I hope you get the picture.
// simplified for presentation here but materially sufficient
describe("when lookups service receives valid lookups data", function () {
var $httpBackend, flush$q, lookups
var lookupsUrlRe = /breeze\/zza\/Lookups\?/; // RegEx of the lookups endpoint
beforeEach(module('app'));
beforeEach(inject(function(_$httpBackend_, $rootScope, _lookups_) {
$httpBackend = _$httpBackend_;
flush$q = function() { $rootScope.$apply(); };
lookups = _lookups_;
}));
beforeEach(function () {
$httpBackend.expectGET(lookupsUrlRe).respond(validLookupsResponse.data);
lookups.ready(); // THIS TRIGGERS CALL TO FETCHLOOKUPS
$httpBackend.flush();
});
it("doesn't bomb", function () {
expect(true).toBe(true);
});
it("'ready()' invokes success callback", function () {
var success = jasmine.createSpy('success');
lookups.ready(success);
flush$q(); // NOTE NEED TO FLUSH $Q IN THIS TEST
expect(success).toHaveBeenCalled();
})
it("has OrderStatus.Pending", function () {
expect(lookups.OrderStatus && lookups.OrderStatus.Pending).toBeDefined();
});
... more tests ...
});
The "lookups" service (app/services/lookups.js) calls breeze to fetch lookups data from the server.
function fetchLookups() {
return breeze.EntityQuery.from('Lookups')
.using(manager).execute()
.then(function () {
logger.info("Lookups loaded from server.");
extendService(manager)
})
.catch(function (error) {
error = util.filterHttpError(error);
logger.error(error.message, "lookups initialization failed");
throw error; // so downstream fail handlers hear it too
});
}
As you might imagine, this is a pretty deep integration test that starts with a service consumed by a ViewModel and goes all the way through the Breeze Angular Service through $http just about to the network boundary before being intercepted by $httpBackend.

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