No doubt that Jacob's article on Unit Testing will be as good as the job he did on this one. You might also want to check out the two I posted on the same topic:
http://www.sqlservercentral.com/columnists/gFritchey/2689.asp
http://www.sqlservercentral.com/columnists/gFritchey/2805.asp
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning