NUnit TestCaseSource 将值传递给工厂 [英] NUnit TestCaseSource pass value to factory

问题描述

我正在使用 NUnit 2.5.3 TestCaseSource 属性并创建一个工厂来生成我的测试.像这样:

I'm using the NUnit 2.5.3 TestCaseSource attribute and creating a factory to generate my tests. Something like this:

[Test, TestCaseSource(typeof(TestCaseFactories), "VariableString")]
public void Does_Pass_Standard_Description_Tests(string text)
{
    Item obj = new Item();
    obj.Description = text;
}

我的来源是这样的:

public static IEnumerable<TestCaseData> VariableString
{
    get
    {
        yield return new TestCaseData(string.Empty).Throws(typeof(PreconditionException))
            .SetName("Does_Reject_Empty_Text");
        yield return new TestCaseData(null).Throws(typeof(PreconditionException))
            .SetName("Does_Reject_Null_Text");
        yield return new TestCaseData("  ").Throws(typeof(PreconditionException))
            .SetName("Does_Reject_Whitespace_Text");
    }
}

我需要做的是向变量字符串添加一个最大长度检查，但是这个最大长度是在被测类的契约中定义的.在我们的例子中，它是一个简单的公共结构:

What I need to be able to do is to add a maximum length check to the Variable String, but this maximum length is defined in the contracts in the class under test. In our case its a simple public struct:

   public struct ItemLengths
    {
        public const int Description = 255;
    }

我找不到任何将值传递给测试用例生成器的方法.我已经尝试过静态共享值，但这些值没有被采用.我不想将内容保存到文件中，因为每次更改代码时我都需要重新生成此文件.

I can't find any way of passing a value to the test case generator. I've tried static shared values and these are not picked up. I don't want to save stuff to a file, as then I'd need to regenerate this file every time the code changed.

我想将以下行添加到我的测试用例中:

I want to add the following line to my testcase:

yield return new TestCaseData(new string('A', MAX_LENGTH_HERE + 1))
    .Throws(typeof(PreconditionException));

概念上相当简单的事情，但我发现不可能做到的事情.有什么建议吗?

Something fairly simple in concept, but something I'm finding impossible to do. Any suggestions?

推荐答案

将测试的参数更改为类而不是字符串.像这样:

Change the parameter of your test as class instead of a string. Like so:

公共类 StringTest {公共字符串 testString;公共 int maxLength;}

public class StringTest { public string testString; public int maxLength; }

然后构造这个类作为参数传递给 TestCaseData 构造函数.这样你就可以传递字符串和你喜欢的任何其他参数.

Then construct this class to pass as an argument to TestCaseData constructor. That way you can pass the string and any other arguments you like.

另一种选择是让测试有 2 个 string 和 int 参数.

Another option is to make the test have 2 arguments of string and int.

然后是 TestCaseData("mystring", 255).您是否意识到它们可以有多个参数?

Then for the TestCaseData( "mystring", 255). Did you realize they can have multiple arguments?

韦恩

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