Resolving the issue of 'undefined is not a function' in my specific situation

I'm currently working on creating unit tests for my controller.

Here's a snippet of what I have:

angular.module('myApp').controller('testCtrl', ['$scope', 'testFactory',
    function($scope, testFactory) {
        //I'm encountering an error when running Karma
        //TypeError: 'undefined' is not a function (evaluating  
        //'$scope.$watch')
        $scope.$watch(function(){
            return testFactory.returnItem; // watching the data returned by the factory
        }, function(newVal){
            console.log('call here')
        });
    }
]}

In my factory file:

angular.module('myApp').factory('testFactory', ['Product','$cookies','$q',
    function(Product ,$cookies, $q) {
        var service = {};
        service.getProduct = function() {
            var deferred = $q.defer();
            var that = this;
            Product.query({
                Id: 123,
            }, function(product) {           
                that.returnItem = product;
                deferred.resolve(product);
            });
            return deferred.promise;
        };
        return service;
    }
]);

For my unit tests:

describe('Test ', function () {
    beforeEach(module('myApp'));
    var $controller, testFactory;

    // Setting up the controller and mock scope
    beforeEach(inject(function(_$controller_, _testFactory_){
        $controller = _$controller_;
        testFactory = _testFactory_;
    }));

    describe('Initial test', function() {
        it('should return data', function() {
            var $scope = {};
            var controller = $controller('testCtrl', {$scope:$scope});
            //not sure what to do next….
        });
    });
})

I've hit a roadblock with the error message and I'm unsure how to proceed with testing the getProduct method in my service from the controller.

Answer №1

When writing unit tests, it's important to remember that you should create a new scope object rather than just an empty object literal. Additionally, make sure to inject a testFactory object when instantiating your controller. Here is an example of how this might look:

describe('Unit Test Example', function () {
    beforeEach(module('myApp'));
    var $controller, testFactory, scope;

    // Set up the controller and mock scope
    beforeEach(inject(function(_$controller_, _$rootScope_, _testFactory_){
        $controller = _$controller_;
        $rootScope = _$rootScope_;
        testFactory = _testFactory_;
    }));

    scope = $rootScope.$new();

    describe('Initial test', function() {
        it('should return data', function() {
            var controller = $controller('testCtrl', {$scope:scope, testFactory:testFactory});
            // Add your expectations here
        });
    });
})

Answer №2

Make sure to include } in the second last line of your code block for it to be correct:

angular.module('myApp').controller('testCtrl', ['$scope', 'testFactory',
    function($scope, testFactory) {
        //I encountered an error while running Karma
        //TypeError: 'undefined' is not a function (evaluating  
        //'$scope.$watch')
        $scope.$watch(function(){
            return testFactory.returnItem; // watch the factory returned data
        }, function(newVal){
            console.log('call here')
        });
    }
]}

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