Tips for conducting an HTTP request test within my application

I am currently facing a challenge while attempting to develop unit tests for my application.

Within my controller, I have the following code snippet:

 $scope.test1 = function() {
     productFactory.getName()
         .then(function(products){
             $scope.result = products;
          })
} 

The 'productFactory' section of my code is defined as:

angular.module('myApp').factory('productFactory', function($http) {
    var factoryObj = {};
    factoryObj.getName = function() {
        return http.get(url)
    }

    return factoryObj
})

In my unit test file, I have:

describe('test here', function () {
    var testCtrl, scope, httpBackend, mockFactory;

    beforeEach(module('myApp', function($provide){
        $provide.value('productFactory', mockFactory);
    }));

    // Initialize the controller and a mock scope
    beforeEach(inject(function (_$controller_, _$rootScope_, _$httpBackend_,  _productFactory_) {
        scope = _$rootScope_.$new();
        httpBackend = _$httpBackend_;
        mockFactory = _productFactory_;

        testCtrl = _$controller_('testCtrl', {
            $scope: scope
        });

    it('should get product name', function() {       
        scope.test1();
        //I am not sure how to test the results
    });
}));

During the execution of karma test, an error occurs:

TypeError: 'undefined' is not an object (evaluating 'productFactory.getName()')

I am seeking guidance on how to effectively test the http result and resolve this issue. Any assistance would be greatly appreciated. Thank you!

Answer â„–1

First and foremost, there is no need to concern yourself with utilizing $provide:

beforeEach(module('myApp'));

1. Without $httpBackend (completely mocking out the service)

In this scenario, productFactory will be injected into your controller, but you should utilize spyOn for the getName() function:

// Set up the controller and a mock scope
beforeEach(inject(function (_$controller_, _$rootScope_, _$httpBackend_,  _productFactory_) {
    scope = _$rootScope_.$new();
    httpBackend = _$httpBackend_;
    mockFactory = _productFactory_;

    // Setting up a spy for the method, wrapping it with $q.when to return a promise
    spyOn(mockFactory, 'getName').and.returnValue($q.when('Pizza!'));

    testCtrl = _$controller_('testCtrl', {
        $scope: scope,
        productFactory: mockFactory  // passing it in here
    });

Next, you must trigger a $digest cycle to ensure the promise gets resolved:

it('should retrieve product name', function() {       
    scope.test1();

    // Trigger the $digest        
    scope.$apply();

    // Expectation
    expect(scope.result).toBe('Pizza!')
});

2. With $httpBackend

// Set up the controller and a mock scope
    beforeEach(inject(function (_$controller_, _$rootScope_, _$httpBackend_) {
        scope = _$rootScope_.$new();
        httpBackend = _$httpBackend_;

        // Initializing $httpBackend
        httpBackend.when('GET', '/products')
                            .respond([{ name: 'Pizza!'}, {name: 'Sandwich'}]);

        testCtrl = _$controller_('testCtrl', {
            $scope: scope
        });

In this case, there is no need to mock the factory at all. Simply use flush on $httpBackend to simulate the HTTP call response:

it('should retrieve product name', function() {       
    scope.test1();

    // Trigger the $digest with flush        
    httpBackend.flush();

    // Expectation
    expect(scope.result.length).toBe(2)
});

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