Unit testing two dependent services and controller in AngularJS - angularjs

Question

I have a demo application where I have a controller which has a factory as dependency and factory itself depends on another service. My code is as follows:
var app = angular.module('sampleApp', ['ui.router']);
app.service("someServ", function(){
this.sendMsg = function(name){
return "Hello " + name;
}
})
app.factory("appFactory", function ($http, someServ) {
function getData(url) {
return $http.get(url);
}
function foo(){
var text = someServ.sendMsg("Monotype");
alert(text);
}
return {
getData : getData,
foo : foo
}
})
var productsController = function ($scope, $http, appFactory) {
var pct = this;
pct.url = "http://mysafeinfo.com/api/data?list=englishmonarchs&format=json";
var jsonDataPromise = appFactory.getData(pct.url);
jsonDataPromise
.then(function (response) {
pct.jsonData = response.data;
}, function (err) {
console.log("Error is: " + error);
});
pct.profun = function(){
appFactory.foo();
}
};
app.controller("productsController", productsController);
productsController.$inject = ['$scope', '$http', 'appFactory'];
I have to test with karma using Jasmine 2.4 as testing framework. I have tried many online tutorials but getting totally confused as everyone tries to do something different. Some use $provide to mock the service, some simply inject the actual service/factory and use a reference, some do not give any example of passing arguments to services.
Can someone please tell me how to do unit testing in simple terms. I have already tried doing something like this:
describe('unit testing of service and controller', function(){
beforeEach(module('sampleApp'));
var prodCtrl, $prodScope, mockfactory, mockservice;
beforeEach(function(){
mockservice = {
sendMsg : function(name){
return name;
}
}
module(function($provide){
$provide.value("someServ", mockservice);
});
inject(function($rootScope, $controller, $http, $q, appFactory){
appFactory = appFactory;
spyOn(appFactory, 'getData');
spyOn(appFactory, 'foo');
$prodScope = $rootScope.$new();
prodCtrl = $controller('productsController', {
$scope: $prodScope, $http: $http, appFactory:appFactory
});
});
});
it('appFactory has method getData and foo', function(){
appFactory.getData();
appFactory.foo();
expect(appFactory.getData).toHaveBeenCalled();
expect(appFactory.foo).toHaveBeenCalled();
})
it('productsController gets a promise back from getData', function(){
var url = "sample url";
var myPromise = prodCtrl.getData(url);
myPromise.then(function(){console.log("Promise returned");})
})
it('foo calls service method sendMsg', function(){
prodCtrl.profun();
expect(mockservice.sendMsg).toHaveBeenCalled();
})
});

Answer 1

I was finally able to solve this issue. My code looks like this:
var app = angular.module('sampleApp', []);
app.service("someServ", function(){
this.sendMsg = function(name){
return "Hello " + name;
}
})
app.factory("appFactory", function ($q, someServ) {
function getData() {
var defer = $q.defer();
defer.resolve("Success message");
return defer.promise;
}
function foo(){
var text = someServ.sendMsg("Monotype");
alert(text);
}
return {
getData : getData,
foo : foo
}
})
app.controller("mainController", ['$scope', '$http','appFactory', function($scope, $http, appFactory){
var mct = this;
mct.printData = function(){
var myPromise = appFactory.getData();
myPromise
.then(function(data){
alert("Promise returned successfully. Data : " + data);
}, function(error){
alert("Something went wrong.... Error: " + error);
})
}
mct.showMsg = function(){
appFactory.foo();
}
}]);
The test case looked like this:
describe('unit testing', function(){
var jsonData = {
name: "Aosis",
id: 12345
}
beforeEach(module('sampleApp'));
beforeEach(module(function($provide){
$provide.service("someServ", function(){
//this.sendMsg = function(param){}
this.sendMsg = jasmine.createSpy('sendMsg').and.callFake(function(param){})
});
$provide.factory("appFactory", function(someServ, $q){
function getData(){
var defer = $q.defer();
defer.resolve("Success message");
return defer.promise;
}
function foo(){
var facParam = "some text";
someServ.sendMsg(facParam);
}
return {
getData : getData,
foo : foo
}
});
}));
var $scope, mainController, appFactoryMock, someServMock;
beforeEach(inject(function($rootScope, $controller, $http, $q, appFactory, someServ){
appFactoryMock = appFactory;
someServMock = someServ;
$scope = $rootScope.$new();
mainController = $controller("mainController", {
$scope : $scope,
$http : $http,
appFactory : appFactoryMock
});
}));
// Tests go here....
});
Here, I have mocked service method as jasmine spy and specified the function that should get executed usingand.callFake(function(){.....}). A fake factory has been created and its methods have been spied upon. I tried to create fake factory similar to service using jasmine.createSpy but return {
getData : getData,
foo : foo
} was giving error. Hence, I did that.
Anyone, else if has better solution or some other explanation, please share.