Timeout causes failure in AngularJS jasmine promise testing

Question

Timeout causes failure in AngularJS jasmine promise testing

I need help testing my login controller, here is the structure of it:

describe('LoginController', function() {
    beforeEach(module('task6'));

    var $controller, LoginService;

    beforeEach(inject(function(_$controller_, _LoginService_) {
        $controller = _$controller_;
        LoginService = _LoginService_;
    }));

    describe('LoginController.submitLogin', function() {
        it('verify if user exists', function(done) {
            var $scope = {};
            var controller = $controller('LoginController', {$scope: $scope});
            var resultValue;
            controller.loginField = 'John';
            controller.password = 'Smith';

            LoginService.signIn(controller.loginField,
                                controller.password)
            .then(function() {
                expect(true).toBe(true);
                done();
            }); 
        });
    });
});

The signIn function looks like this:

function signIn(loginField, password) {
        var defer = $q.defer();
   if (loginField && password) {
        defer.resolve("success");
   } else {
        defer.reject("failed");
   }
   return defer.promise;
}

However, I keep getting the error message "Async callback was not invoken within timeout specified..."

javascript angularjs jasmine promise q

Answer 1

Answer №1

Make sure to always include $scope.$digest() at the end of your test in order to properly resolve promises. Promises cannot be resolved within the same digest cycle they were created in.

Elaboration

Although it could have been feasible for the framework to handle instant resolution within the same cycle, the decision was made against it. Consider the following scenario to understand why it might pose a problem:

function login(login, password) {
    LoginService.signIn(login, password)
        .then(function() {
            cancelLoadingAnimation();
        });

    startLoadingAnimation(); 
}

Typically, promises are resolved asynchronously, so issues do not arise. In this case, the loading animation starts in the login function and gets cancelled upon successful sign in. But imagine if the promise instantly resolved (as in a test scenario); the animation could potentially be cancelled before even starting.

To avoid this, one solution is to move the call to startLoadingAnimation() above the signIn() call. However, ensuring promises are resolved asynchronously simplifies code understanding.

Update: @gnerkus points out in their response that creating the $scope as a child of the $rootScope is essential. However, it is crucial to implement both solutions for resolution.

Answer 2

Make sure to always include $scope.$digest() at the end of your test in order to properly resolve promises. Promises cannot be resolved within the same digest cycle they were created in.

Elaboration

Although it could have been feasible for the framework to handle instant resolution within the same cycle, the decision was made against it. Consider the following scenario to understand why it might pose a problem:

function login(login, password) {
    LoginService.signIn(login, password)
        .then(function() {
            cancelLoadingAnimation();
        });

    startLoadingAnimation(); 
}

Typically, promises are resolved asynchronously, so issues do not arise. In this case, the loading animation starts in the login function and gets cancelled upon successful sign in. But imagine if the promise instantly resolved (as in a test scenario); the animation could potentially be cancelled before even starting.

To avoid this, one solution is to move the call to startLoadingAnimation() above the signIn() call. However, ensuring promises are resolved asynchronously simplifies code understanding.

Update: @gnerkus points out in their response that creating the $scope as a child of the $rootScope is essential. However, it is crucial to implement both solutions for resolution.

Answer 3

Answer №2

To ensure proper functionality, establish the scope object as an instance of $rootScope within the controller:

describe('LoginController', function() {
  beforeEach(module('task6'));

  var $controller, LoginService;

  // Utilize the $rootScope service to create new scope instances.
  beforeEach(inject(function($rootScope, _$controller_, _LoginService_) {
    $controller = _$controller_;
    LoginService = _LoginService_;
  }));

  describe('LoginController.submitLogin', function() {
    it('checks for existing user', function(done) {
      // Generate a new scope for the controller.
      var scope = $rootScope.$new();
      var controller = $controller('LoginController', {$scope: scope});
      var resultValue;
      controller.loginField = 'John';
      controller.password = 'Smith';

      LoginService.signIn(controller.loginField,
                            controller.password)
        .then(function() {
            expect(true).toBe(true);
            done();
        }); 
    });
  });
});

Answer 4

To ensure proper functionality, establish the scope object as an instance of $rootScope within the controller:

describe('LoginController', function() {
  beforeEach(module('task6'));

  var $controller, LoginService;

  // Utilize the $rootScope service to create new scope instances.
  beforeEach(inject(function($rootScope, _$controller_, _LoginService_) {
    $controller = _$controller_;
    LoginService = _LoginService_;
  }));

  describe('LoginController.submitLogin', function() {
    it('checks for existing user', function(done) {
      // Generate a new scope for the controller.
      var scope = $rootScope.$new();
      var controller = $controller('LoginController', {$scope: scope});
      var resultValue;
      controller.loginField = 'John';
      controller.password = 'Smith';

      LoginService.signIn(controller.loginField,
                            controller.password)
        .then(function() {
            expect(true).toBe(true);
            done();
        }); 
    });
  });
});

Answer 5

Answer №3

It turns out that both @gnerkus and @lex82 were correct - in order to handle promises properly, a $digest cycle needs to be run. However, the tricky part is ensuring that a real scope is referenced to achieve this. I have managed to come up with a final, functional version of my code:

describe('LoginController', function() {
    beforeEach(module('task6'));

    var $rootScope, $controller, LoginService;

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

    describe('LoginController.submitLogin', function() {
        it('checks for the existence of a user', function(done) {
            var $scope = $rootScope.$new();
            var controller = $controller('LoginController', 
                                         {$scope: $scope});
            controller.loginField = 'John';
            controller.password = 'Smith';
            LoginService.signIn(controller.loginField,
                                controller.password)
            .then(function(logged) {
                expect(true).toBe(true);
                done();
            })
            $scope.$digest();
        });
    });
});

Big thanks to everyone who helped out!

Answer 6

It turns out that both @gnerkus and @lex82 were correct - in order to handle promises properly, a $digest cycle needs to be run. However, the tricky part is ensuring that a real scope is referenced to achieve this. I have managed to come up with a final, functional version of my code:

describe('LoginController', function() {
    beforeEach(module('task6'));

    var $rootScope, $controller, LoginService;

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

    describe('LoginController.submitLogin', function() {
        it('checks for the existence of a user', function(done) {
            var $scope = $rootScope.$new();
            var controller = $controller('LoginController', 
                                         {$scope: $scope});
            controller.loginField = 'John';
            controller.password = 'Smith';
            LoginService.signIn(controller.loginField,
                                controller.password)
            .then(function(logged) {
                expect(true).toBe(true);
                done();
            })
            $scope.$digest();
        });
    });
});

Big thanks to everyone who helped out!

Timeout causes failure in AngularJS jasmine promise testing

Answer №1

Answer №2

Answer №3

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