Angular.js承诺在使用业力进行单元测试服务时无法解决 [英] Angular.js promise not resolving when unit testing service with karma

问题描述

我正在尝试对Angular.js服务进行单元测试，并且需要对从Mock服务返回的promise（使用Jasmine）设置一个期望值。我正在使用业力单元测试框架。相关的代码片段如下：

I am trying to unit test an Angular.js service, and need to set an expect on a promise returned from a Mock service (using Jasmine). I am using the karma unit testing framework. The relevant code snippet is below:

// I can't figure out how to do the equivalent of a $scope.$digest here. 
var loginStatusPromise = FacebookService.getFacebookToken();
loginStatusPromise.then(function(token) {
    expect(false).toBeTruthy(); // If this test passes, there is something going wrong!
    expect(token).not.toBeNull(); // The token should be ValidToken
    expect(token).toBe('ValidToken');
});

可以看到完整的单元测试代码这里。

The complete unit test code can be seen here.

问题是当业力执行时，promise.then语句永远不会触发。因此，我的期望陈述都没有被执行。
在我的控制器测试中，我使用$ scope。$ digest（）来解决这些承诺，但我不清楚在服务测试中如何做到这一点。我认为在服务测试中没有范围的概念。

The problem is the promise.then statement never fires when karma is executing. Hence, none of my expect statements are executed. In my controller tests, I use $scope.$digest() to resolve the promises, but I am not clear on how to do this in a service test. As I thought there was no notion of 'scope' in a service test.

我在这里有错误的结尾吗？我是否需要将$ rootScope注入我的服务测试，然后使用$ digest？或者，还有另一种方法吗？

Do I have the wrong end of the stick here? Do I need to injecct $rootScope into my service test and then use $digest? Or, is there another way?

推荐答案

假设您正在使用 ngFacebook / ngModule 在解决方案/想法之前快速说明该项目没有单元测试！你确定要使用这个项目吗？

Assuming that you are using ngFacebook/ngModule a quick note before the solution/ideas is that this project does not have unit tests ! Are you sure you want to use this project ?

我在Github上快速扫描了你的单元测试，发现以下缺失： -

I did a quick scan of your Unit Tests on Github and found following missing:-

1）模块初始化。
ngFacebook需要或你需要初始化你做同样事情的模块。

1) Module initialization. ngFacebook needs that or you need to initialize your module that does the same thing.

beforeEach(module('ngFacebook'));

OR

beforeEach(module('yieldtome'));

2）认真考虑模仿ngFacebook模块

在单元级别测试中，您正在模拟气泡中测试代码，其中外部接口被删除。

At unit level tests you are testing your code within a mocked bubble where outside interfaces are stubbed out.

否则）尝试添加调用API，如下所示： -

Otherwise) Try adding calling the API as below:-

 $rootScope.$apply(function() {
     this.FacebookService.getFacebookToken().then(function(){
        //your expect code here
     });
    });
 $httpBackend.flush();//mock any anticipated outgoing requests as per [$httpBackend][2]

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