Using PRINT within a function (SQL Server)

Have you ever tried using PRINT function inside another user defined function in SQL Server?
Well i recently tried doing this and to my surprise i found that we can not use PRINT function inside another user defined function.
I tried a lot to find the reason for this, but no luck. I am not sure why SQL Server team always comes with such shortcomings.

We often use PRINT function as a mean for debugging our Database scripts or procedures. so now question is how can we debug user defined functions without PRINT function.
Well guys if you are expecting any other alternate solution from me then i wont disappoint you. The only option to make sure that your user defined function is working properly is to test the script before making it a function. Meaning you test your script first with all possible scenarios and inputs, then you can make it as function.

Thats it guys, this is the only solution to this for now.
If any of you have any other better solution then do let everyone know here. Also don't forget to write in your valuable comments.