Microsoft's forthcoming Visual Studio Team System will include source code control, integrated defect tracking, testing, reports, and a bunch of other project management and project governance tools and capabilities. All built in and integrated. BUT! That does not mean that there are not other options, even open source options. AnkhSVN and Igloo are a couple examples of source code control add-ins for Visual Studio. NUnit covers unit testing. There are others, too! Here's a brief list, with some details:

http://www.dotnetslackers.com/Visual_Studio/re-16278_Open_Source_and_Visual_Studio.aspx