与嘲讽起订量扩展方法 [英] Mocking Extension Methods with Moq

问题描述

我有一个preexisting接口...

I have a preexisting Interface...

public interface ISomeInterface
{
    void SomeMethod();
}

和我使用一个混合扩展了这一intreface ...

and I've extended this intreface using a mixin...

public static class SomeInterfaceExtensions
{
    public static void AnotherMethod(this ISomeInterface someInterface)
    {
        // Implementation here
    }
}

我有一个类，多数民众赞成在调用此，我想测试...

I have a class thats calling this which I want to test...

public class Caller
{
    private readonly ISomeInterface someInterface;

    public Caller(ISomeInterface someInterface)
    {
        this.someInterface = someInterface;
    }

    public void Main()
    {
        someInterface.AnotherMethod();
    }
}

和一个测试，我想模拟接口和调用验证的扩展方法...

and a test where I'd like to mock the interface and verify the call to the extension method...

    [Test]
    public void Main_BasicCall_CallsAnotherMethod()
    {
        // Arrange
        var someInterfaceMock = new Mock<ISomeInterface>();
        someInterfaceMock.Setup(x => x.AnotherMethod()).Verifiable();

        var caller = new Caller(someInterfaceMock.Object);

        // Act
        caller.Main();

        // Assert
        someInterfaceMock.Verify();
    }

但是运行这个测试会生成异常...

Running this test however generates an exception...

System.ArgumentException: Invalid setup on a non-member method:
x => x.AnotherMethod()

我的问题是，有没有模拟出的混入调用一个不错的方式？

My question is, is there a nice way to mock out the mixin call?

推荐答案

您不能直接模拟静态方法（因此扩展方法）与嘲讽框架。您可以尝试痣（ http://research.microsoft.com/en-美国/项目/ PEX / downloads.aspx ），来自微软的免费工具，它实现了不同的方法。
这里是该工具的说明：

You can't "directly" mock static method (hence extension method) with mocking framework. You can try Moles (http://research.microsoft.com/en-us/projects/pex/downloads.aspx), a free tool from Microsoft that implements a different approach. Here is the description of the tool:

痣是在.NET测试存根和弯路是基于一个代表轻量级框架。

Moles is a lightweight framework for test stubs and detours in .NET that is based on delegates.

摩尔数可用于绕任何.NET方法，包括在密封类型的非虚拟/静态方法

Moles may be used to detour any .NET method, including non-virtual/static methods in sealed types.

您可以使用痣任何测试框架（它是独立的事情）。

You can use Moles with any testing framework (it's independent about that).

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