Actionscript 3 :: Test Individual Classes In A Flex Project?

I need to write and test xmlStuff.as. I would like to test it on its own without launching the entire application (launched with index.mxml).

Project
Folder: src
Package: Default Package
- index.mxml[c

If I was using java what I would do is I would create a new package: [url].....

And I would put this code in it:

public class xmlStuffTester {
public static void main(String [] args){
XmlStuff xs = new XmlStuff();[code]...

(Alternatly I would write a unit test if I knew exactly what the xml output should be. I don't know that yet so I prefer the above approach.)Question: What is the standard way to do this in Flex builder?