设置方法使用参数数组 [英] Setup Method With Params Array

问题描述

我开发一个应用程序的测试。还有，有一个 PARAMS 数组作为参数的方法。我已成立的方法，使用起订量，但是当我运行测试，该方法的返回值是零，这意味着它不被嘲笑。

下面是一个代码示例：

 公共接口ITicketManager {
串GetFirstTicketInQueueIfMatches（PARAMS字符串[] ticketsToMatch）; 
} 
 
公共类TicketManager：ITicketManager {
专用队列<串GT; ticketQueue =新队列<串GT;（）; 
 
公共字符串GetFirstTicketInQueueIfMatches（PARAMS字符串[] ticketsToMatch）{
 VAR firstQueuedTicket = ticketQueue.Peek（）; 
 VAR firstQueuedTicketMatchesAnyOfRequested = ticketsToMatch.Any（T =>吨== firstQueuedTicket）; 
 
如果（firstQueuedTicketMatchesAnyOfRequested）
返回firstQueuedTicket; 
 
返回NULL; 
} 
} 
  

中的模拟代码如下所示：

  VAR模拟=新模拟< ITicketManager>（）; 
 
 mock.Setup（M = GT; m.GetFirstTicketInQueueIfMatches（It.IsAny<串GT;（）））
 .Returns（P => {
如果（第包含（A））
返回A; 
 
返回NULL; 
}）; 
  

为什么它从来没有碰到嘲笑的方法？

解决方案

您正在试图调用采取一个字符串，而不是一个数组的方法。请记住，这是C＃编译器它处理 PARAMS 部分，转换调用代码刚刚指定单独的值传递到阵列中的一个电话。至于方法本身而言，它只是得到一个数组 - 这就是你在嘲笑什么

编译器是的真正的转弯你的代码到：

  mock.Setup（M = GT; m.GetFirstTicketInQueueIfMatches 
（新的String [] {它.IsAny<串>（）}））
  

这是不是你想要的。

您应该使用：

  mock.Setup（M = GT，M。 GetFirstTicketInQueueIfMatches（It.IsAny<字符串[]>（）））
  

如果您需要验证它只是被赋予一个值，你需要做的，在你会为一个非PARAMS参数相同的方式。

基本上， PARAMS 只能在本C＃编译器的差异 - 不是起订量

I am developing tests for an application. There's a method that has a params array as a parameter. I have set up the method using Moq but when I run the test, the return value of the method is null, which means it is not being mocked.

Here's a code sample:

public interface ITicketManager {
    string GetFirstTicketInQueueIfMatches(params string[] ticketsToMatch);
}

public class TicketManager : ITicketManager {
    private Queue<string> ticketQueue = new Queue<string>();

    public string GetFirstTicketInQueueIfMatches(params string[] ticketsToMatch) {
        var firstQueuedTicket = ticketQueue.Peek();
        var firstQueuedTicketMatchesAnyOfRequested = ticketsToMatch.Any(t => t == firstQueuedTicket);

        if(firstQueuedTicketMatchesAnyOfRequested)
            return firstQueuedTicket;

        return null;
    }
}

The mock code looks like this:

var mock = new Mock<ITicketManager>();

mock.Setup(m => m.GetFirstTicketInQueueIfMatches(It.IsAny<string>()))
    .Returns(p => { 
    if(p.Contains("A"))
            return "A";

    return null;
});

Why it never hits the mocked method?

解决方案

You're trying to call a method taking a single string, rather than an array. Bear in mind that it's the C# compiler which handles the params part, converting calling code which just specifies individual values into a call passing in an array. As far as the method itself is concerned, it's just getting an array - and that's what you're mocking.

The compiler is actually turning your code into:

mock.Setup(m => m.GetFirstTicketInQueueIfMatches
                        (new string[] { It.IsAny<string>() }))

which isn't what you want.

You should use:

mock.Setup(m => m.GetFirstTicketInQueueIfMatches(It.IsAny<string[]>()))

If you need to verify that it only gets given a single value, you'll need to do that in the same way you would for a non-params parameter.

Basically, params only makes a difference to the C# compiler - not to moq.

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