可以使用jasmine在指令中测试scope.trains的双向绑定吗？

Question

我正在尝试使用jasmine在自定义指令中测试双向绑定。

这是js：

angular.module('MyServiceModule',[]);

angular.module('MyServiceModule').controller('MyController',MyController);
angular.module('MyServiceModule').directive('trainDirective',trainDirective);



function MyController($http)
{
    console.log('MyController');
    vm = this;

    vm.openCreateQuoteScreen = function(trainName)
    {
            alert("train type"+trainName);
    }

    vm.trainList = [
                         {"trainName":"Shatabdi"},
                         {"trainName":"Rajdhani"}
                   ];
}



function trainDirective()
{
    return{
        restrict: 'E',
        template: '<div>TRAIN LIST</div>'+
                    '<ul data-ng-repeat="train in trains">'+
                    '<li>{{ train.trainName }}</li></ul>',

        scope: {
            trains: '=',

        },
    };
}

这是html：

<div ng-app="MyServiceModule" ng-controller="MyController as MyCtrl" >
     <train-directive trains="MyCtrl.trainList"> </train-directive>
</div>

如何在下面的测试中编写测试双向数据绑定：

describe('my directive', function(){
beforeEach(module('MyServiceModule'));

beforeEach(function(){  
        element=angular.element('<train-directive trains="MyCtrl.trainList"> </train-directive>');
         compiledElement = $compile(element)(scope);
        scope.$digest();
    });
});
it('should test two-way data binding',function(){
    element.isolateScope().trains = "My trains";


      //Now I want to test if the same value is reflected in the parent scope's trainList variable.

expect(scope.trainList).toEqual('My trains');

    });

我在这里做错了什么？有没有人能解释一下我该怎么纠正它？

Answer 1

绑定不会神奇地更新，它们是在摘要上更新的。应该将MyCtrl.trainList更改为trainList，因为scope不属于具有controllerAs语法的实际控制器，并且没有MyCtrl对象。

它应该是

   element.isolateScope().trains = "My trains";
   scope.$digest();
   ...