PhpStorm PhpUnit via phar autocomplete not working

In order to have a PHAR archive indexed by the IDE it has to have a .phar extension (that's a requirement).

The easiest solution is to place phpunit.phar somewhere in your project (usually it would be PROJECT_ROOT/vendor/ folder).

If having local copy inside the project folder is not desired (for whatever reason; although Composer and other similar kind of tools (bower/npm/etc) are primarily aimed at keeping dependency stuff/packages locally), you may use symbolic links:

• either create a symbolic link to that file locally (e.g. PROJECT_ROOT/phpunit.phar --> /usr/bin/phpunit)
• or place a full copy (or such symbolic link) in a separate folder outside of the project and then reference it via PhpStorm's Settings | PHP | Include Paths functionality.