There can be a lot of problems with phpunit if you do not install it from a pear, but from a hand. Without a more detailed conclusion, I have no idea.
My advice is just to use a pear. I know there are problems, but try
pear update pear pear channel-update pear.phpunit.de pear install
It works for more than 90% of the people I talked to, and they have a problem when phpunit runs on windows.
If for some reason this does not solve your problem, please comment and I will try to find another solution. (Perhaps you can add some console exit messages / error messages)
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