I have installed Mountain Lion and I can't get phpunit to work.
$ pear config-get bin_dir
/Users/greg/pear/bin
$cd /Users/greg/pear/bin
$ls
pear*
peardev*
pecl*
phpunit*
$phpunit
-bash: phpunit: command not found
Read this blog post: http://vanderveer.be/blog/2012/10/12/setting-up-my-perfect-developer-environment-on-osx-10-dot-8-mountain-lion-10-dot-8-2-final-edition/
$ sudo cp /private/etc/php.ini.default /private/etc/php.ini
$ sudo php /usr/lib/php/install-pear-nozlib.phar
$ pear config-set php_ini /private/etc/php.ini
$ pecl config-set php_ini /private/etc/php.ini
$ sudo pear upgrade-all
Works for me.