与MS Moles一起使用DataContext吗? [英] Moling DataContext with MS Moles?

问题描述

我如何才能在类中使用正在使用的DataContext将消息写到表中.我想断言LINQ正在写入的表具有预期的消息数.这就是我到目前为止所拥有的.

How can I mole the DataContext that I'm using in a class to write messages to a table. I'd like to assert that the table LINQ is writing to has the expected count of messages. Here's what i have so far.

var context = new MJustTestingDataContext();
MyMessagewriter writer = new MyMessageWriter(context);

var messageList = new List<MIncmoingMessage>();
MTable<MIncomingMessage> messageTable = new MTable<MIncomingMessage>();
messageTable.Bind(messagesLinqList.AsQueryable());

如果我在被测类中将此代码与xUnit一起使用，则会收到此异常

If I use this code with xUnit in my class under test I'll get this exception

Microsoft.Moles.Framework.Moles.MoleNotImplementedException: DataContext.Dispose() was not moled.

我在这里缺少什么，以及如何在the鼠上实现DataContext.Dispose()?我使用的是没有Pex的痣.

What am I missing here and how to implement DataContext.Dispose() on the mole? I'm using moles standalone without Pex.

推荐答案

创建新的Mole时，其方法和属性的默认行为是在调用它们时抛出MoleNotImplementedException.

When you create a new Mole the default behavior for its methods and properties is to throw a MoleNotImplementedException whenever they are called.

要实现mole，您可以执行context.Dispose = () => {};，这意味着在moled实例上调用Dispose方法时没有任何反应. 我重读了这个问题，由于Dispose是在基类中定义的，因此您可能遇到了问题.要使用摩尔基法，您需要执行以下操作:

To implement the mole you can do context.Dispose = () => {}; which means that nothing happens when the Dispose method gets called on the moled instance. I reread the question and you probably are having a problem since Dispose is defined in a base class. To mole base method you need to do the following:

var context = new MJustTestingDataContext();
var baseContext = new MDataContext(context);

baseContext.Dispose = () => {};

您将需要实现被测试代码调用的每个属性/方法，或者您可以使用方法BehaveAsDefaultValue全局设置Mole实例的默认行为.这样，痣中的每个方法将不执行任何操作，并返回默认值(如果存在的话)为其返回类型，而不是抛出MoleNotImplementedException.但是，如果您需要这种行为，最好使用存根而不是葡萄胎.

You'll need to implement every property/method that gets called by the code under test or you can set the default behavior for the mole instance globally using the method BehaveAsDefaultValue. This way every method in the mole will do nothing and return the default value for it's return type if one exists instead of throwing a MoleNotImplementedException. However if you require this behavior it's better to use a stub than a mole.

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