Tips for effectively testing a function in my specific scenario

I'm facing a challenge with creating a unit test for the child controller. In the child controller, I made a function call to the parent.

Child Controller

$scope.clickMe = function(){
    $scope.parentMethod();
})

Parent Controller

$scope.parentMethod = function(item){
    //perform actions in the parent
})

Unit Test

var childCtrl;

 beforeEach(module('myApp'));
    beforeEach(inject(function (_$controller_, _$rootScope_) {
        scope        = _$rootScope_.$new();
        childCtrl = _$controller_('childCtrl', {
            $scope: scope
        });
    }));

    describe('testing parent method', function() {
        it('should invoke parent method', function() {
            $scope.clickMe();
            $httpBackend.flush();
        });
    });
});

Currently encountering an issue:

TypeError: 'undefined' is not a function (evaluating '$scope.parentMethod()')

Seeking assistance on resolving this matter. Any help would be greatly appreciated. Thank you!

Answer №1

If you want to properly test the child controller, it is recommended to mock the method in the scope.

    scope        = _$rootScope_.$new();
    scope.parentMethod = function noop(){};
    childCtrl = _$controller_('childCtrl', {
        $scope: scope
    });

During testing, replace the noop function with a spy. The exact syntax will vary depending on whether you are using Jasmine or Sinon. This approach will allow you to verify that the parentMethod was indeed called during the test.

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