Moq伪造一种方法，但使用另一种方法的实际实现 [英] Moq fake one method but use real implementation of another

问题描述

给出具有Method1()和Method2()的接口IService.

我想测试当Method1()抛出Exception时，调用Method2()并返回给定值.

I want to test that when Method1() throws an Exception, Method2() is called and returns a given value.

(抛出Method1()时会调用Method2()).

因此，我需要使用伪造的Method1()测试真实的Method2()，它们是同一接口的方法.

Therefore I need to test a real Method2() with a fake Method1(), they are methods of the same interface.

这是我的测试代码:

MBase sut.MethodX()是唯一的入口点.它使用IService.

MBase sut.MethodX() is the only entry point. It uses IService.

我的目的是断言Method2()返回某物.

// Arrange
// Fake bytes in.
var networkStreamMock = new Mock<INetworkStream>();
networkStreamMock.Method1(x => x.Read(It.IsAny<byte[]>(), It.IsAny<int>(), It.IsAny<int>())).Returns(It.IsAny<byte[]>());

// Force throw TimeoutException.
var mock = new Mock<IService>();
mock.Setup(x => x.Method1(new Message
{ 
    Xml = Xml,  
}
)).Throws<TimeoutException>();

// Check Method 2 is called. (this is done in its own test so commented out)
// mock.Setup(m => m.Method2(It.IsAny<Message>())).Verifiable();

// New MBase.
IKernel kernel = new StandardKernel(new FakeBindings());
kernel.Rebind<IService>().ToConstant(mock.Object);
MBase sut = kernel.Get<M>();

// Act
sut.MethodX(networkStreamMock.Object);

// Here I would like to assert on the return value of Method2
mock.Verify(m => m.Method2(It.IsAny<Message>()));

Moq或其他模拟框架是否可能?我该怎么做? 我可以使用Method1()的伪实现和Method2()的真实实现创建手动模拟，但是我想知道是否有更好的方法.

Is this possible with Moq or another mocking framework? How do I do it? I can create a manual mock with a fake implementation of Method1() and a real implementation of Method2() but I wonder if there is a better approach.

我已经单独测试了IService，但现在我想测试它与MBase的交互.

I have already tested IService in isolation but I now wish to test it's interaction with MBase.

推荐答案

您可以执行以下操作:

var mock = new Mock<MyNetworkStream>(){ CallBase = true };
mock.Setup(m => m.Method1....

上面的代码将对未明确设置的任何方法/属性使用MyNetworkStream的实际实现. IE.它会调用真实的Method2()，而Method1()将是模拟版本.

The above code will use the real implementation of MyNetworkStream for any method/property which is not explicitly setup. I.e. it'll call the real Method2(), while the Method1() will be the mocked version.

CallBase=true通常用于测试抽象类(如果是对还是错，不在此问题范围之内).

CallBase=true is usually meant to test abstract classes (if this is right or wrong, is out of the scope of this question).

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