Now that I'm on our “SQL Team” (kinda scary isn't it) I'm trying to implement some semblance of unit testing and source control for our SQL stored procedures. I just downloaded a copy of ApexSQL Edit and have been playing around with it. I right clicked on a stored procedure, and there was this beautiful little menu choice:

So I click on it, and low and behold, it generated good ol' NUnit test harness code! You can even add conditionals and manage your tests through the UI. Very cool indeed.
Update. Very buggy indeed, not sure I can recommend the current version for purchase but still cool.
-Brendan