Moqing静态方法对C#库类的调用 [英] moqing static method call to c# library class

问题描述

这似乎是一个简单的问题，但我似乎找不到能影响搜索的关键字.

This seems like an easy enough issue but I can't seem to find the keywords to effect my searches.

我试图通过模拟此方法调用中的所有对象来进行单元测试.我可以对我自己的所有作品做到这一点，除了以下一个:

I'm trying to unit test by mocking out all objects within this method call. I am able to do so to all of my own creations except for this one:

public void MyFunc(MyVarClass myVar)
{
    Image picture;
    ...

    picture = Image.FromStream(new MemoryStream(myVar.ImageStream));

    ...
}

FromStream是Image类(属于c#的一部分)的静态调用.因此，由于我真的不想为单元测试提供图像流，因此如何重构我的代码以进行模拟.

FromStream is a static call from the Image class (part of c#). So how can I refactor my code to mock this out because I really don't want to provide a image stream to the unit test.

推荐答案

您可以将静态函数包装到Func类型属性中，该属性可以由单元测试使用模拟或存根设置.

You could wrap the static function into Func type property which can be set by the unit test with a mock or stub.

public class MyClass
{
    ..

    public Func<Image, MemoryStream> ImageFromStream = 
                                     (stream) => Image.FromStream(stream);


    public void MyFunc(MyVarClass myVar)
    {
        ...

        picture = ImageFromStream(new MemoryStream(myVar.ImageStream));

        ...
    }


    ..
}

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