我有一个事件侦听器的控制器在我的角度应用，定义如下：

I have a controller with an event listener in my Angular app, defined as follows.

  angular.module('test').controller('TestCtrl', function($rootScope, $scope, testService) {

    [...]

    $scope.$on("myEvent", function(args, value) {
      testService.doStuff(value);
    });
  });

这工作完全在应用程序本身。然而，当我试图单元测试控制器的功能（使用的茉莉花的和的噶的），每个测试方法引发以下错误：

This works perfectly in the app itself. However, when I try to unit test the functionality of the controller (using Jasmine and Karma), each test method throws the following error:

 TypeError: $scope.$on is not a function in [...]/testController.js

我在测试方法创建控制器如下：

I create the controller in my test methods as follows.

  it('does stuff', inject(function($rootScope, $controller, testService) {
    var scope = $rootScope.$new;
    $controller('TestCtrl', {
      $scope : scope
    });

    [...]
  }));

我可以改变我的控制器使用解决问题 rootScope 而不是：

  $rootScope.$on(...)

但当然预期的应用程序不工作了。我还可以按在我的测试code引入 $关于办法摆脱错误的：

  var scope = $rootScope.$new;
  scope.$on = function() {};

但嘲讽听众喜欢这种失败的测试目的，我真正的code的。

but mocking the listener like this kind of defeats the purpose of testing my real code.

为什么不试code找到 $关于 在 范围 ？（但发现它 rootScope ，还是......）

Why doesn't the test code find the $on method of the scope? (But finds it on rootScope, still...)

必须有一些基本的东西，我很想念这里，但我一直没能甚至很多google搜索和阅读角源$ C ​​$ C的后看着办吧。

There must be something fundamental that I'm missing here but I haven't been able to figure it out even after lots of googling and reading the Angular source code.

推荐答案

$ rootScope。$新的是一个函数。你需要调用它（ $ rootScope $新的（））：

$rootScope.$new is a function. You need to invoke it ($rootScope.$new()):

it('does stuff', inject(function($rootScope, $controller, testService) {
  var scope = $rootScope.$new();
  $controller('TestCtrl', {
    $scope : scope
  });

  [...]
}));

例普拉克：http://plnkr.co/edit/t1x62msmOQDkNItGzcp9?p=$p$pview