If you’re trying to run PHPUnit from the terminal in Mac OSX Lion, you may get an error similar to the following.
File/Iterator/Autoload.php failed to open stream
You can resolve this by running the following commands.
curl http://pear.php.net/go-pear.phar > go-pear.php sudo php -q go-pear.php
PHPUnit should now run without errors (or at least, without errors in their code 😉 ).