If you are running in to the following problem when creating unit tests when using database projects, there now is a fix!
Consider the following scenario, you have you database project (.dbproj) open and requesting the creation of a Database Unit Test by right clicking on for example a stored procedure objects inside Schema View. This will active the Create Unit Tests wizard. However, the following problems occur in the Create Unit Tests wizard:
This problem is in more detail described in the following KB article, http://support.microsoft.com/kb/962866
A fix is now available at MSDN Code Gallery, see http://code.msdn.microsoft.com/KB962866