{PHPUnit}

sudo pear upgrade PEAR
sudo pear channel-discover pear.phpunit.de
pear channel-discover components.ez.no
pear channel-discover pear.symfony-project.com
sudo pear install –alldeps phpunit/PHPUnit

{Selenium RC or Core}

Download frist.

cd path/to/Selenium
java -jar selenium-server-standalone-2.16.1.jar
or 
java -jar /usr/local/selenium-server/selenium-server-standalone-2.16.1.jar