[dba-SQLServer] Testing UDFs

I couldn't agree more.
One thing that I would is a mention of the templates available. Open
Management Studio and then select View | Templates. A pane will open on the
right listing the numerous templates available to you. They write skeleton
code for your proc or UDF. In the list of templates, you will find several
that pertain to writing UDFs.

Here's an article for TechRepublic on using templates:

http://articles.techrepublic.com.com/5100-10878_11-5653868.html

hth,
Arthur