Visual Studio built-in tool for unit test?

I heard there is built-in tool in VS2010 for unit test for C#. I am using .Net 4.0 + C#. Any tutorial recommended for such 开发者_JS百科built-in tool for a beginner? What is the pros and cons of such tool compared to NUnit?

Here a links comparing MsTest and NUnit: http://weblogs.asp.net/rosherove/archive/2010/03/05/nunit-vs-mstest-nunit-wins-for-unit-testing.aspx http://it-tutorials.us/software/2320.aspx

In terms of functionality, both provide comparable features, especially for a beginner. I think the biggest difference between the two tools is that one is free and one is not. MsTest is a commercial tool and is not usually included with all versions of Visual Studio. On the other hand, NUnit is free and can be used with any IDE. Another thing to consider is that almost all build servers have NUnit integration to not only run NUnit tests, but also process the generated XML reports.