c# - N用代表代替，检查收到的电话？

Question

在接口(interface)上检查接收到的调用时，我可以这样做:

void Main()
{
    var logger = Substitute.For<ILogger>();
    Test(logger);
    logger.Received().Log(Arg.Any<string>());
}

public void Test(ILogger logger)
{
    logger.Log("Test");
}

public interface ILogger
{
    void Log(string message);
}

如果我注释掉 logger.Log("Test"); 调用，我会得到:

ReceivedCallsException: Expected to receive a call matching:
Log(any String)
Actually received no matching calls.

然而，我最近才发现 NSubstitute 可以替代委托(delegate)。问题是，我能否让它检查委托(delegate)是否被调用？

void Main()
{
    var logger = Substitute.For<Action<string>>();
    Test(logger);
    // What.Received().What()?
}

public void Test(Action<string> logger)
{
    logger("Test");
}

Answer 1

这个问题的答案其实很简单。

我不是在替换“函数调用”，我当然是在替换整个委托(delegate) type，而不仅仅是调用语法部分。

所以这很好用:

logger.Received()(Arg.Any<string>());

产生(假设我注释掉了对委托(delegate)的调用):

ReceivedCallsException: Expected to receive a call matching:
Invoke(any String)
Actually received no matching calls.

根据您对语法的看法，只需拼出正在发生的事情，它就可以变得“更清晰”:

logger.Received().Invoke(Arg.Any<string>());