Filename completion with all directories in 'path'?

[Ben Kovitz]

Is there a way to make filename completion (pressing tab at the command 
line in :find) use all the directories in the 'path'?

A little background: I have unit tests in one directory, and mainline 
code in a separate directory.  This is needed for source-code control 
and other things.  But it would be nice if, in vim, I could pretend 
that everything is in one directory.  I've done :set 
path=unit/test/dir,main/code/dir and stuff like ]f and :find works 
fine.  It's just a little jarring that pressing tab when I type :fin 
only runs through the files in the directory I started in.

Ben Kovitz