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。

xUnit是新项目的另一种可能。它的语法可能更直观，但它与其他框架并不兼容。

我从MSTest开始，但我因为一个简单的原因而改变了。MSTest不支持从其他程序集继承测试方法。

我讨厌多次编写相同的测试。特别是在一个大型项目中，测试方法可以很容易地运行到100个测试。

NUnit正是我所需要的。NUnit唯一缺少的是Visual Studio插件，它可以显示每个测试的红色/绿色状态(就像VSTS一样)。

如果你正在考虑MSTest或NUnit，那么我建议你看看MbUnit。我的理由是

TestDriven.Net compatibility. Nothing beats have TestDriven.Net.ReRunWithDebugger bound to a keyboard combination. The Gallio framework. Gallio is a test runner like NUnit's. The only difference is it doesn't care if you wrote your tests in NUnit, MSTest, xUnit or MbUnit. They all get run. Compatibility with NUnit. All features in NUnit are supported by MbUnit. I think you don't even need to change your attributes (will have to check that), just your reference and usings. Collection asserts. MbUnit has more Assert cases, including the CollectionAssert class. Basically you no longer need to write your own tests to see if two collections are the same. Combinatorial tests. Wouldn't it be cool if you could supply two sets of data and get a test for all the combinations of data? It is in MbUnit.

我最初选择MbUnit是因为它的[RowTest ....我找不到一个回去的理由。我把我所有的活动测试套件从NUnit移过来，再也没有回头。从那时起，我已经将两个不同的开发团队转换为收益。

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.

我不喜欢Visual Studio的内置测试框架，因为它迫使你创建一个单独的项目，而不是把你的测试作为你正在测试的项目的一部分。