I'm not exactly sure about using the Phar of PHPUnit, but try the following on the command line:
php phpunit.phar index.php
I assume that PHPUnit is reading $argv
to look up which tests to run.
Alternatively you may try creating a phpunit.xml.dist
file in the directory, and running simply phpunit
, which should do it.
As said, I have no idea about Phars