I am on a Windows platform and my PHP is version 5.5.3. I tried to install the PHPUnit and I get:
C:\xampp\php>pear install pear.phpunit.de/PHPUnit
Attempting to discover channel "pear.phpunit.de"...
downloading channel.xml ...
Starting to download channel.xml (804 bytes)
....done: 804 bytes
Auto-discovered channel "pear.phpunit.de", alias "phpunit", adding to registry
No releases available for package "pear.phpunit.de/PHPUnit"
Any tips on installing PHPUnit on a Windows platform?