如何设置最小起订量索引属性 [英] How to Moq Setting an Indexed property

问题描述

我试图使用模拟来验证索引属性被设置。下面是带索引的起订量，能够对象：

I'm trying to use mock to verify that an index property has been set. Here's a moq-able object with an index:

public class Index
{
    IDictionary<object ,object> _backingField 
        = new Dictionary<object, object>();

    public virtual object this[object key]
    {
        get { return _backingField[key]; }
        set { _backingField[key] = value; }
    }
}

首先，使用试过设置（）：

[Test]
public void MoqUsingSetup()
{
    //arrange
    var index = new Mock<Index>();
    index.Setup(o => o["Key"]).Verifiable();
    // act
    index.Object["Key"] = "Value";
    //assert
    index.Verify();
}

...这失败 - 它必须验证对获得{}

所以，我尝试使用 SetupSet（）：

[Test]
public void MoqUsingSetupSet()
{
    //arrange
    var index = new Mock<Index>();
    index.SetupSet(o => o["Key"]).Verifiable();
}

...这给出了一个运行时异常：

... which gives a runtime exception:

System.ArgumentException : Expression is not a property access: o => o["Key"]
at Moq.ExpressionExtensions.ToPropertyInfo(LambdaExpression expression)
at Moq.Mock.SetupSet(Mock mock, Expression`1 expression)
at Moq.MockExtensions.SetupSet(Mock`1 mock, Expression`1 expression)

什么是实现这一目标的正确方法是什么？

What's the correct way to accomplish this?

推荐答案

这应该工作

[Test]
public void MoqUsingSetup()
{
    //arrange
    var index = new Mock();
    index.SetupSet(o => o["Key"] = "Value").Verifiable();
    // act
    index.Object["Key"] = "Value";
    //assert
    index.Verify();
}

您可以只把它像一个正常的属性setter。

You can just treat it like a normal property setter.

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