Executing AngularJs controller functions invoke Jasmine test suite with Karma

I am relatively new to using Karma and Jasmine for writing unit tests on my AngularJs application.

During the test suite execution, I noticed that functions called to initialize data in my controller are automatically being triggered. Is there a way to prevent this automatic call during testing?

Below is the snippet of code:

BaseCtrl.js

App.controller('BaseCtrl', ['$scope', '$rootScope', 'Data', function($scope, $rootScope, Data){
    //initialize
    $rootScope.loader = false;
    $rootScope.data = false;

    $scope.init = function(){
        $rootScope.loader = true;
        Data.init(function(data){
            $rootScope.loader = false;
            $rootScope.data = data;
        });   
    };

    $scope.init();
}])

Data.js

App.service('Data', ['$http', function($http){
    return {
        init:function(callback){
            $http.get('/url').success(function(response){
               callback(response);
            });
        }
    };
}]);

BaseCtrl.spec.js

describe('BaseCtrl', function(){
    beforeEach(module('app'));

    var $controller, $rootScope, $scope;

    beforeEach(inject(function(_$controller_, _$rootScope_){
        $controller = _$controller_;
        $rootScope = _$rootScope_.$new();
    }));

    describe('Loader', function(){
        var controller, $scope = {};
        beforeEach(function(){
            controller = $controller('BaseCtrl', {$scope:$scope, $rootScope:$rootScope});
        });

        it('should be false by default', function(){

            // Check the default value
            expect($rootScope.loader).toBe(false);

            // Some code to determine the call, then

            expect($rootScope.loader).toBe(true);

            // Some code to determine the call is done, then

            expect($rootScope.loader).toBe(false);
        });
    });
});

Answer №1

Indeed, utilize $httpBackend to generate a fake response of your choice.

$httpBackend.when('GET', '/endpoint').respond({});

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