使用Moq模拟功能构造函数参数，并验证它是否被调用两次 [英] Using Moq to Mock a Func<> constructor parameter and Verify it was called twice

问题描述

从本文中提出问题(如何进行仿制)，并进行了改编作为答案是不正确的.

Taken the question from this article (How to moq a Func) and adapted it as the answer is not correct.

public class FooBar
{
    private Func<IFooBarProxy> __fooBarProxyFactory;

    public FooBar(Func<IFooBarProxy> fooBarProxyFactory)
    {
        _fooBarProxyFactory = fooBarProxyFactory;
    }

    public void Process() 
    {
        _fooBarProxyFactory();
        _fooBarProxyFactory();
    }
}

我需要模拟作为构造函数参数传递的Func<>，该函数断言该函数被调用了两次.

I have a need to mock a Func<> that is passed as a constructor parameter, the assert that the func was call twice.

尝试模拟函数var funcMock = new Mock<Func<IFooBarProxy>>();时，由于Func类型不可模拟，因此Moq会引发异常.

When trying to mock the function var funcMock = new Mock<Func<IFooBarProxy>>(); Moq raises and exception as the Func type is not mockable.

问题在于，如果不模拟函子，就无法验证函子被调用了(n)次. funcMock.Verify( (), Times.AtLeast(2));

The issue is that without mocking the func it is not possible to verify that the func was called (n) times. funcMock.Verify( (), Times.AtLeast(2));

推荐答案

我认为没有必要对Func使用模拟.

I don't think it is necessary to use a mock for the Func.

您可以简单地自己创建一个普通的Func，该函数返回IFooBarProxy的模拟:

You can simply create an ordinary Func yourself that returns a mock of IFooBarProxy:

int numberOfCalls = 0;
Func<IFooBarProxy> func = () => { ++numberOfCalls;
                                  return new Mock<IFooBarProxy>(); };

var sut = new FooBar(func);

sut.Process();

Assert.Equal(2, numberOfCalls);

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