如何创建包含一个只读成员的接口的单元测试存根？

问题描述

我写一些单元测试因为我已经写在的IPrincipal 的扩展方法。为了帮助，我已经创建了几个辅助类的（一些代码，接口没有实现的成员已为简洁起见省略）：

I am writing some unit tests for an extension method I have written on IPrincipal. To assist, I have created a couple of helper classes (some code for not-implemented members of the interfaces has been omitted for brevity):

public class IPrincipalStub : IPrincipal
{
    private IIdentity identityStub = new IIdentityStub();

    public IIdentity Identity
    {
        get { return identityStub; }
        set { identityStub = value; }
    }
}

public class IIdentityStub : IIdentity
{
    public string Name { get; set; } // BZZZT!!!
}

但是，名称在的IIdentity 接口属性为只读（即的IIdentity 接口指定的名称一个getter而不是setter属性）。

However, the Name property in the IIdentity interface is read-only (the IIDentity interface specifies a getter but not a setter for the Name property).

我如何可以设置为测试目的我的存根对象的Name属性，如果接口定义了它作为一个只读属性？

How can I set the Name property in my stub object for testing purposes if the interface has defined it as a read-only property?

推荐答案

您正在使用自动属性C＃功能，而是你应该去手动路线和属性创建一个支持字段。一旦你有一个支持字段，你可以在构造函数中设置它的值（或使它成为一个公共领域，并设置它，你有对象后，但是这是一个有点丑陋）。

You're using the auto-properties feature of C# but instead you should go the manual route and create a backing field for the property. Once you have a backing field you can set its value in the constructor (or make it a public field and set it after you have the object, but this is a little uglier).

public class IIdentityStub : IIdentity{
    private string _name;

    public IIdentityStub(string name){
        _name = name;
    }

    public string Name { get { return _name; } }
}

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