phpunit installed via phive.
When calling phpdbg -qrr /usr/local/bin/phpunit the folling NOTICE is shown:

[PHP Notice:  Undefined index: _SERVER in /usr/local/bin/phpunit on line 18]

Guess that $_SERVER is simply not set in phpdbg?

This line raises the notice, I guess in build/binary-phar-autoload.php.in:

if (__FILE__ === realpath($GLOBALS['_SERVER']['SCRIPT_NAME'])) {