Documentation :

emblem-notice-24.pngThis new major version requires PHP ≥ 5.6 (PHPUnit is available in remi, as PHP 5.4 and 5.5 have reached their EOL).

Installation, Fedora:

dnf --enablerepo=remi install phpunit

Installation, Enterprise Linux:

yum --enablerepo=remi,remi-php56 install phpunit

Notice: this tool is an essential component of PHP QA in Fedora. This version is also available in official repository of Fedora rawhide (so used by Koschei). I plan an update in Fedora 24 and 25 soon.