嘲笑了EX pression与NSubstitute [英] Mocking out expression with NSubstitute

问题描述

我有一个包含以下方法签名的接口：

I have a interface that contains the following method signature:

TResult GetValue<T, TResult>(object key, Expression<Func<T, TResult>> property) where T : class;

使用起订量，我可以嘲笑这种方法的一个特定的呼叫是这样的：

Using Moq, I'm able to mock a specific call of this method like this:

var repo = new Mock<IRepository>();
repo.Setup(r => r.GetValue<Customer, string>("SomeCustomerId", c => c.SecretAgentId)).Returns("SecretAgentId");

后来，当我这样做的呼叫

Then when I do this call

repo.Object.GetValue<Customer, string>("SomeCustomerId", c => c.SecretAgentId);

Tt的回报SecretAgentId如我所料，所以一切都看起来很好。

Tt returns "SecretAgentId" as I expect, so everything looks fine.

我的问题是，在我们的实际生产code，我们使用NSubstitute，而不是起订量。我试着用同样类型的安装位置：

My problem is that in our real production code we use NSubstitute, and not Moq. I tried using the same type of setup here:

var repo = Substitute.For<ICrmRepository>();
repo.GetValue<Customer, string>("SomeCustomerId", c => c.SecretAgentId).Returns("SecretAgentId");

不过，当我做下面的来电来访。

However, when I do the following call here

repo.GetValue<Customer, string>("SomeCustomerId", c => c.SecretAgentId);

它返回的，而不是SecretAgentId

我试图取代 C =＆GT; c.SecretAgentId 与 Arg.Any＆LT;防爆pression＆LT; Func键＆LT;客户，串＆GT;＆GT;＆GT;（）如果只是为了看看它的工作原理，然后，再返回SecretAgentId预期。但我需要验证它被称为与正确的前pression，而不是任何EX pression。

I tried replacing c => c.SecretAgentId with Arg.Any<Expression<Func<Customer, string>>>() just to see if it works then, and then it returns "SecretAgentId" as expected. But I need to verify that it is called with the correct expression, and not just any expression.

所以，我需要知道，如果有可能得到这个NSubstitute工作，如果是，怎么了？

So I need to know if it is possible to get this to work in NSubstitute, and if it is, how?

推荐答案

我不记得确切的语法，所以请原谅我，如果这不是A1正确的，这是一个有点缺憾，但...

I can't remember exact syntax, so forgive me if this isn't A1 correct, and it is a bit kludgy but...

我相信你是在正确的轨道，当你试图Arg.Any，但尝试使用Arg.Is是这样的：

I believe you were on the right track when you tried Arg.Any, however try using Arg.Is like this:

Arg.Is<Expression<Func<Customer, string>>>(x => { 
    var m = ((Expression)x).Body as MemberExpression;
    var p = m.Member as PropertyInfo;
    return p.Name == "SecretAgentId";
});

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