Ways to develop tests for functions specific to my scenario

Currently, I am attempting to implement a timeout function test within my application.

Within the controller:

$scope.$watch('toy',function(toyVar){
       if(toyVar == 1) {
        //perform actions       
        } else {
           $timeout(function() {
              $window.alert('toy is old');
           }, 3000);
        }
});

Test file:

describe('test', function () {
    var ctrl, scope;    
    beforeEach(module('testApp'));
    beforeEach(inject(function (_$controller_, _$rootScope_) {
        scope = _$rootScope_.$new();

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

    describe('testing section', function() {
        it('should validate the functionality of the timeout function', function() {
            //uncertain about how to create the test here
        })
    })
});

I'm unsure on how to compose a test for the $timeout segment of the code. Any assistance would be greatly appreciated! Thank you!

Answer №1

To ensure that a specific task has been completed, it is crucial to check if the alert function was triggered. Here are the steps required for verification:

  • Monitor $window.alert to confirm whether it was invoked.
  • Assign a value other than 1 to the variable toy.
  • Trigger a $digest to execute the $watch.
  • Invoke flush on $timeout to simulate the passage of time and run the function.
  • Confirm that the $window.alert function ran successfully, indicating that all tasks were completed.

An example implementation is demonstrated below:

it('should check if timeout function works', function() {
  spyOn($window, 'alert');
  $scope.toy = 2;
  $scope.$digest();
  $timeout.flush();
  expect($window.alert).toHaveBeenCalledWith('toy is old');
});

Additionally, it is recommended not to utilize the underscore syntax unless absolutely necessary.

View the functionality in action here

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