Karma-Jasmine:如何正确监视 Modal?

2022-01-11 00:00:00 angularjs jasmine javascript ionic-framework karma-runner

情况:

我正在对我的 Angular/Ionic 应用程序进行单元测试.

I am unit testing my Angular / Ionic app.

我遇到了模态问题.目前我可以测试模态是否已被调用.到此为止.我无法测试模态的正确 show() 和 hide() 方法.

I am having troubles with the modal. At the moment i can test that the modal has been called. That's all so far. I cannot test the proper show() and hide() method of the modal.

我收到以下错误:

TypeError: $scope.modal_login.show is not a function
Error: show() method does not exist

TypeError: $scope.modal_login.hide is not a function
Error: hide() method does not exist

我认为这完全取决于间谍.我不知道如何正确监视模态，我认为一旦完成，一切都会正常工作.

I think it depends entirely on the spy. I don't know how to properly spy on the modal, and i think that once that is done, everything will work fine.

代码:

控制器:

$scope.open_login_modal = function() 
{
    var temp = $ionicModal.fromTemplateUrl('templates/login.html',{scope: $scope});

    temp.then(function(modal) { 
        $scope.modal_login = modal;
        $scope.modal_login.show();

        $scope.for_test_only = true;
    });
};

$scope.close_login_modal = function() 
{
    $scope.modal_login.hide();
};

注意:open_login_modal函数的代码已经重构，方便测试.原来的代码是:

Note: the code of open_login_modal function has been refactored to facilitate the test. The original code was:

$scope.open_login_modal = function() 
{
    $ionicModal.fromTemplateUrl('templates/login.html', {
        scope: $scope
    }).then(function(modal) {

        $scope.modal_login = modal;
        $scope.modal_login.show();
    }); 
};

测试:

describe('App tests', function() 
{
    beforeEach(module('my_app.controllers'));

    function fakeTemplate() 
    {
        return { 
            then: function(modal){
                $scope.modal_login = modal;
            }
        }
    }

    beforeEach(inject(function(_$controller_, _$rootScope_)
    {
        $controller = _$controller_;
        $rootScope = _$rootScope_;
        $scope = _$rootScope_.$new();

        $ionicModal = 
        {
            fromTemplateUrl: jasmine.createSpy('$ionicModal.fromTemplateUrl').and.callFake(fakeTemplate)
        }; 

        var controller = $controller('MainCtrl', { $scope: $scope, $rootScope: $rootScope, $ionicModal: $ionicModal });
    }));


    describe('Modal tests', function() 
    {
        beforeEach(function()
        {
            $scope.open_login_modal();
            spyOn($scope.modal_login, 'show'); // NOT WORKING
            spyOn($scope.modal_login, 'hide'); // NOT WORKING
        });

        it('should open login modal', function() 
        {
            expect($ionicModal.fromTemplateUrl).toHaveBeenCalled(); // OK
            expect($ionicModal.fromTemplateUrl.calls.count()).toBe(1); // OK
            expect($scope.modal_login.show()).toHaveBeenCalled(); // NOT PASS
            expect($scope.for_test_only).toEqual(true); // NOT PASS
        });

        it('should close login modal', function() 
        {
            $scope.close_login_modal();     
            expect($scope.modal_login.hide()).toHaveBeenCalled(); // NOT PASS
        });
    });

});

从代码 $scope.for_test_only 可以看出，它应该等于 true，但无法识别.我收到此错误消息:

As you can see from the code $scope.for_test_only it should be equal to true but is not recognized. I get this error message instead:

Expected undefined to equal true.

show() 和 hide() 方法也是如此.测试中看不到它们.

The same happens to the show() and hide() method. They are not seen by the test.

我认为是因为它们没有在间谍中声明.

And i think because they are not declared in the spy.

问题:

我怎样才能正确地监视模式?

How can i properly spy on a modal?

非常感谢！

推荐答案

这里的问题可以推断为如何正确地窥探 Promise.您在这里非常正确.

The question here could be extrapolated to how to properly spy on a promise. You are very much on the right track here.

但是，如果你想测试调用成功的回调函数，你必须执行两个步骤:

However, if you want to test that whatever your callback to the success of the promise is called, you have to execute two steps:

  1. 模拟服务(在您的情况下为 $ionicModal)并返回一些假函数
  2. 在该假函数中，执行生产代码传递给您的回调.

这是一个插图:

//create a mock of the service (step 1)
var $ionicModal = jasmine.createSpyObj('$ionicModal', ['fromTemplateUrl']);

//create an example response which just calls your callback (step2)
var successCallback = {
   then: function(callback){
       callback.apply(arguments);
   }
};

$ionicModal.fromTemplateUrl.and.returnValue(successCallback);

当然，如果您不想自己维护承诺，您可以随时使用 $q:

Of course, you can always use $q if you don't want to be maintaining the promise on your own:

//in your beforeeach
var $ionicModal = jasmine.createSpyObj('$ionicModal', ['fromTemplateUrl']);
//create a mock of the modal you gonna pass and resolve at your fake resolve
var modalMock = jasmine.createSpyObj('modal', ['show', 'hide']);
$ionicModal.fromTemplateUrl.and.callFake(function(){
    return $q.when(modalMock);
});


//in your test
//call scope $digest to trigger the angular digest/apply lifecycle
$scope.$digest();
//expect stuff to happen
expect(modalMock.show).toHaveBeenCalled();

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