用Moq测试接受委托的方法 [英] Testing a method accepting a delegate with Moq

问题描述

我的代码使用的组件实现了这样的接口

my code is using a component implementing an interface like this

public interface IFoo 
{ 
    void DoSomething(string p1);

    void DoSomething(string p1, Action<string> p2);
}

到目前为止，我正在使用第一种方法，但是我打算移至第二种方法，并且我希望将覆盖率保持在尽可能高的水平.

As of this moment, I'm using the first method, but I plan to move to the second one and I want to keep my coverage as high as possible.

只是我真的不知道如何检查委托，甚至不设置Moq来模拟界面.

Just that I really don't know how to inspect the delegate or even just setup Moq to mock the interface.

我尝试过

mock.Setup(p => p.DoSomething(It.IsAny<string>(), It.IsAny<Delegate>()));
mock.Setup(p => p.DoSomething(It.IsAny<string>(), It.IsAny<Action<string>>()));

但任何一个都不会让我建立.有什么建议吗?

but neither will let me build. Any suggestion?

推荐答案

该行:

mock.Setup(p => p.DoSomething(It.IsAny<string>(), It.IsAny<Delegate>()));

必须不进行编译，因为DoSomething需要Action<string>，并且Delegate不能隐式转换为Action<string>.您的另一行:

must not compile becaue DoSomething requires an Action<string>, and Delegate is not implicitly convertible to Action<string>. Your other line:

mock.Setup(p => p.DoSomething(It.IsAny<string>(), It.IsAny<Action<string>>()));

有效且正确！

仅当p2满足某些条件时才能设置，例如:

You can setup only when p2 satisfies some criterion, for example:

mock.Setup(p => p.DoSomething(It.IsAny<string>(),
    It.Is((Action<string> p2) => p2 != null && p2.Target is SomeClass)
    ));

或者您可以使用CallBack进行检查:

Or you can use CallBack to check things:

mock.Setup(p => p.DoSomething(It.IsAny<string>(), It.IsAny<Action<string>>()))
    .CallBack((string p1, Action<string> p2) =>
    {
        // your code (for example Asserts) here,
        // use p2
    });

当然，您可以检查Action<string> 的数量是有限制的，但是您可以查看它是否为非空值，查看其p2.Target是否为非空值或具有特定类型或等于给定实例，则可以查看p2.Method是否是已知(命名)方法，或者如果期望有所谓的多播委托，则可以使用p2.GetInvocationList().

Of course, there is a limit to how much you can inspect an Action<string>, but you can see if it is non-null, see if its p2.Target is non-null or has a specific type or equals a given instance, you can see if p2.Method is a known (named) method, or you could use p2.GetInvocationList() if you expect a so-called multicast delegate.

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