如何测试使用Jasmine在回调中执行的操作

Question

我有两个控制器和一个服务。在第一个控制器中，我订阅了一个事件来做一些事情。第二个控制器执行一些操作，并在完成时广播该事件。请参阅下面的示例，超时仅用于模拟长时间运行的操作。我想测试hasLoaded设置为true使用Jasmine 2.0请指教。

var myApp = angular.module('MyApp', []); 
 

 
myApp.controller('MyCtrl1', ['$scope', 'myService', function($scope, myService) { 
 
    $scope.hasLoaded = false; 
 
    $scope.fileName = ''; 
 
    
 
    myService.onLoaded($scope, function(e, data){ 
 
     // I want to test the following two lines, in the really the code here is much more complex 
 
     $scope.fileName = data.fileName; 
 
     $scope.hasLoaded = true; 
 
    }); 
 
}]); 
 

 
myApp.controller('MyCtrl2', ['$rootScope', '$scope', '$timeout', 'myService', function($rootScope, $scope, $timeout, myService) { 
 
    $scope.isLoading = false; 
 
    $scope.title = 'Click me to load'; 
 

 
    $scope.load = function(){ 
 
     $scope.isLoading = true; 
 
     $scope.title = 'Loading, please wait...'; 
 
     
 
     $timeout(function() { 
 
      $rootScope.$emit('loaded', { fileName: 'test.txt'}); 
 
     }, 1000); 
 
    }; 
 

 
    myService.onLoaded($scope, function(){ 
 
     $scope.hasLoaded = true; 
 
    }); 
 
}]); 
 

 
myApp.service('myService', ['$rootScope', function ($rootScope) { 
 
    this.onLoaded = function(scope, callback) { 
 
     var handler = $rootScope.$on('loaded', callback); 
 
     scope.$on('$destroy', handler); 
 
    }; 
 
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script> 
 

 
<div ng-app="MyApp"> 
 
    <div ng-controller="MyCtrl1"> 
 
     <div ng-show="hasLoaded">{{fileName}} loaded !!!</div> 
 
    </div> 
 
    <div ng-controller="MyCtrl2"> 
 
     <button ng-click="load()" ng-hide="hasLoaded" ng-disabled="isLoading" ng-bind="title"></button> 
 
    </div> 
 
</div>

更新：我已经加入到参数广播呼叫，使其更接近我的情况。

Answer 1

你真的应该分别测试你的每件作品（控制器和服务）。在你的情况下，对于设置hasLoaded控制器测试正常真的只需要测试与正确的服务和回调您的注册做你所期望的：

it("should register with the service and do the right thing when the callback is executed", inject(function ($controller, $rootScope, myService) { 
     var $scope = $rootScope.$new(); 
     spyOn(myService, 'onLoaded').and.callThrough(); 

     var ctrl = $controller('MyCtrl1', {$scope: $scope, myService: myService}); 
     $scope.$apply(); 

     //verify that the controller registers its scope with the service 
     expect(myService.onLoaded).toHaveBeenCalledWith($scope, jasmine.any(Function)); 
     //now call the callback that was registered to see if it sets the property correctly 

     var mockData = { 
      fileName: 'some file name' 
     }; 
     myService.onLoaded.calls.argsFor(0)[1]('loaded', mockData); 
     expect($scope.hasLoaded).toBeTruthy(); 
     expect($scope.fileName).toBe("some file name"); 
    })); 

为您服务，其他然后编写测试控制器分开。