最小起订量中的返回值过载 [英] Overloaded return values in MOQ

问题描述

我正在努力了解有关Moq的设置和单元测试的更多信息.不过，我遇到了一个小问题.

I'm working on understanding a bit more about Setup and unit testing with Moq. I've run into a slight problem though.

我想做的是这样的:

view.Setup(x => x.GetReference("object1")).Returns(object1);
view.Setup(x => x.GetReference("object2")).Returns(null);

但是，当我以这种方式进行调用时，我从未碰到会对Null语句做出反应的代码块.我应该如何设置我的安装程序，以便在由特定参数调用它们时以特定方式运行?

However, when I make my call this way, I never hit the block of code that would react to the Null statement. How am I supposed to set up my Setups so that they will behave in a specific way when they are called by a specific argument?

推荐答案

moq重载了两种返回值的方法:

The moq overloads two ways to return a value:

1. instance: Returns(instance);
2. delegate(Func<T>): Returns(()=>new Foo());

1. instance: Returns(instance);
2. delegate(Func<T>): Returns(()=>new Foo());

我认为问题是由于使用了Return方法的模棱两可引起的.

I think that the problem is caused from the ambiguousness for which Returns method is to be used.

因此，您需要通过以下方式为代码的第二个设置传递显式类型的NULL:

So, you need to pass in the explicit type of NULL for the second setup of your code as the following ways:

1. view.Setup(x => x.GetReference("object2")).Returns((ExplicitType)null);
2. view.Setup(x => x.GetReference("object2")).Returns(() => null);

1. view.Setup(x => x.GetReference("object2")).Returns((ExplicitType)null);
2. view.Setup(x => x.GetReference("object2")).Returns(() => null);

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