与NUnit相比，我对Visual Studio单元测试的主要不满是Visual Studio测试创建倾向于为私有成员访问注入一堆生成的代码。

有些人可能想测试他们的私有方法，有些人可能不想。那是另一个话题了。

我担心的是，当我编写单元测试时，它们应该被严格控制，这样我才能确切地知道我在测试什么以及我如何测试它。如果有自动生成的代码，我就失去了一些所有权。

单元测试框架实际上并不重要，因为你可以用单独的项目文件和条件编译转换测试类(就像这样，Visual Studio→NUnit):

 #if !NUNIT
  using Microsoft.VisualStudio.TestTools.UnitTesting;
 #else
  using NUnit.Framework;
  using TestClass = NUnit.Framework.TestFixtureAttribute;
  using TestMethod = NUnit.Framework.TestAttribute;
  using TestInitialize = NUnit.Framework.SetUpAttribute;
  using TestCleanup = NUnit.Framework.TearDownAttribute;
  using TestContext = System.String;
  using DeploymentItem = NUnit.Framework.DescriptionAttribute;
 #endif

TestDriven。Net插件很好，不是很贵…对于普通的Visual Studio 2008，你必须从你的测试类或测试列表中找到测试。TestDriven。Net中，您可以直接从正在测试的类中运行测试。毕竟，单元测试应该易于维护，并且离开发人员很近。

Visual Studio 2008内置单元测试框架的优点/变化:

The 2008 version now is available in professional editions (before it required expensive versions of Visual Studio, and this is just for developer unit testing) that left a lot of developers with the only choice of open/external testing frameworks. Built-in API supported by a single company. Use the same tools to to run and create tests (you may run them using the command line also MSTest). Simple design (granted without a mock framework, but this is a great starting point for many programmers). Long term support granted (I still remember what happened to NDoc, and I don't want to commit to a testing framework that might not be supported in five years, but I still consider NUnit a great framework). If using Team Foundation Server as your backend, you can create work items or bugs with the failed test data in a simple fashion.

据我所知，目前。net有四个可用的单元测试框架:

NUnit 运行工具 MSTest xUnit

NUnit一直处于领先地位，但在过去一年左右，这种差距已经缩小。我自己还是更喜欢NUnit，特别是他们不久前添加了一个流畅的界面，这使得测试非常易读。

如果您刚刚开始进行单元测试，这可能没有太大区别。一旦你跟上了进度，你就能更好地判断哪个框架最适合你的需求。

Daok列出了Visual Studio 2008测试项目的所有优点。下面是NUnit的优点。

NUnit has a mocking framework. NUnit can be run outside of the IDE. This can be useful if you want to run tests on a non-Microsoft build server, like CruiseControl.NET. NUnit has more versions coming out than visual studio. You don't have to wait years for a new version. And you don't have to install a new version of the IDE to get new features. There are extensions being developed for NUnit, like row-tests, etc. Visual Studio tests take a long time to start up for some reason. This is better in Visual Studio 2008, but it is still too slow for my taste. Quickly running a test to see if you didn't break something can take too long. NUnit with something like Testdriven.Net to run tests from the IDE is actually much faster. Especially when running single tests. According to Kjetil Klaussen, this is caused by the Visual Studio testrunner. Running MSTest tests in TestDriven.Net makes MSTest performance comparable to NUnit.

Visual Studio测试框架的一个小麻烦是，它会创建许多测试运行文件，这些文件往往会使您的项目目录变得混乱——尽管这并不是什么大问题。

另外，如果你缺少一个像TestDriven这样的插件。NET，你不能在Visual Studio环境中调试你的NUnit(或MbUnit, xUnit等)单元测试，而你可以在Microsoft Visual Studio测试框架中进行，这是内置的。