Error: The JavaScript variable 'undefined' is being used as a function, which is incorrect. This error occurs when trying to execute the function `mockBackend

I am currently working on unit testing an AngularJS controller using Karma and Jasmine.

Below is the test suite I have created:

describe('Controllers', function(){
    var $scope, ctrl;
    beforeEach(module('curriculumModule'));
    describe('CreateCurriculumCtrl', function(){
        var mockBackend, location;
        beforeEach(inject(function($rootScope, $controller, _$httpBackend_, $location){
            mockBackend = _$httpBackend_;
            location = $location;
             $scope = $rootScope.$new();
             ctrl = $controller('CreateCurriculumCtrl', {
                    $scope: $scope
             });
        }));

        it('should successfully save the curriculum', function(){
            mockBackend.expectPost('bignibou/curriculum/new');
            $scope.saveCurriculum();
            mockBackend.flush();
            expect(location.path()).toEqual("/");
        });

    });
});

The output from running karma start is as follows:

PhantomJS 1.9.2 (Linux) Controllers CreateCurriculumCtrl should successfully save the curriculum FAILED
    TypeError: 'undefined' is not a function (evaluating 'mockBackend.expectPost('bignibou/curriculum/new')')
        at /home/julien/Documents/projects/site-garde-enfants/bignibou/karma/test/spec/curriculum.test.js:16
PhantomJS 1.9.2 (Linux): Executed 2 of 2 (1 FAILED) (0.203 secs / 0.023 secs)

I'm struggling to understand why this error is occurring, given that I have correctly included the angular-mock.js file in my karma configuration:

// list of files / patterns to load in the browser
files: [
   '../src/main/webapp/js/libs/jquery-1.10.2.js',
   '../src/main/webapp/js/libs/angular.js',
   '../src/main/webapp/js/libs/bootstrap.js',
   '../src/main/webapp/js/plugins/angularui.select2.js',
   'test/vendor/angular-mocks.js',

  '../src/main/webapp/js/custom/curriculum.js',
  'test/spec/curriculum.test.js'      
],

If anyone could provide some assistance, it would be greatly appreciated.

Edit: Here is the code for my controller:

function CreateCurriculumCtrl($scope, $http, $location, select2Options){

    $scope.formData={};

    $scope.select2Options = select2Options; 

    $scope.saveCurriculum = function(){
        $http.post('bignibou/curriculum/new', $scope.formData).success(function(data) {
            if(data.status=="OK"){}
            if(data.status=="KO"){}
            $location.path("/");
        });
    };
}
javascriptangularjskarma-runner

Answer №1

On line 16, I made the following change:

Instead of

mockBackend.expectPost('bignibou/curriculum/new');

I updated it to

mockBackend.expect('POST','bignibou/curriculum/new').respond({});

This adjustment resolved the issue at hand...

edit: expectPOST would have also been a valid solution... It was simply a case sensitivity error that caused the initial problem...

Answer №2

Chances are your scenario will resemble the following:

var x = {};
x.y();

The function x.y is not defined, so attempting to execute it will result in an error.

On line 16, we have $scope.saveCurriculum(), but is $scope.saveCurriculum actually undefined?

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