[XeTeX] xetex needs testfontavailability file???

[Abdorrahman Manian]

Hello to all

I'm a completely newbie to tex and xetex typecasting system. I have
installed xetex in ubuntu from texlive but when I want to compile the
attached file, I get this error  "I can't find file testfontavailability'".
The sample file is written in Farsi (Persian) and introduced as a sample
file for xetex. I've searched my machine and internet for
"testfontavailability" file but with no success at all.
Thanks in advance.

-- 
Abdurrahman Manian
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