单元测试ngResource $保存 [英] Unit-testing ngResource $save

问题描述

我有它包装一个RESTful API的资源。我使用的资源从我的控制器来创建新的对象，并将其保存，类似于从角文档这个片段：

I have a resource which wraps a RESTful API. I use that resource from my controller to create new objects and save them, similar to this snippet from the Angular docs:

var newCard = new CreditCard({number:'0123'});
newCard.name = "Mike Smith";
newCard.$save();

当写入茉莉花一个单元测试，我得到以下错误执行$保存呼叫时：无法读取属性未定义'$承诺'。

When writing a unit test in Jasmine, I get the following error when the $save call is executed: "Cannot read property '$promise' of undefined".

什么是测试在我的控制器，它包含上述code中的方法，最好的方法？

What's the best approach to testing the method in my controller which contains the above code?

推荐答案

如果您使用茉莉花的 spyOn（）函数来验证 $资源方法被调用时，它会覆盖原来的 $资源方法，一个实现了间谍的功能。

If you use Jasmine's spyOn() function to verify that a $resource method is called, it overwrites the original $resource method with one that implements the "spying" functionality.

如果你的应用程序中的code依赖于 $资源设置$承诺财产，或者它依赖返回的对象/数组从 $资源，茉莉花的间谍功能，将不返回任何东西，或设置在$承诺属性的值。其结果是，被测试时，在你的应用程序完美的罚款code将失败。当你使用类似的事情发生 $ HTTP 与则（），成功（） 或错误（）功能。

If the code in your application relies on the $resource setting the $promise property, or it relies on the returned object/array from the $resource, the Jasmine's spy function won't return anything or set a value on the $promise property. As a result, perfectly fine code in your application will fail when being tested. A similar thing happens when you use $http with the then(), success(), or error() functions.

要解决，你可以使茉莉花的功能间谍以及通过做这样的事情调用原始的功能：

To work around that you can make Jasmine spy on the function as well as call the original function by doing something like this:

// Newer Jasmine 2.0 syntax:
spyOn(resource, "$save").and.callThrough();
// Older syntax:
spyOn(resource, "$save").andCallThrough();

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