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Rather than manually checking in the latest phpunit.phar file and rename it to contemplate_koans, we should make it an automatic download/checksum/chmod/rename via CI (github actions) whenever new code is pushed in to php_koans. This will also protect against a malicious version of phpunit sneaking via a contributor. I haven't messed with Github actions to know if this is possible or straightforward.

Because PHPUnit 10 did away with the printerClass config setting, the band-new-developer friendly output no longer works. There is a new event base architecture that needs to be used, either directly or some existing adapter plugin. I would rather not use plugin/library for several reasons, the primary being I don't want to add to the installation process for new users.

There are a few projects that have accomplished migrating to the event system and it's worth looking at how they did it and follow their pattern. Examples are czim/phpunit-printer and paratest. The latter looks more straight forward, but there might something I'm missing.

So we need to migrate https://github.com/akoebbe/php_koans/blob/master/KoansLib/KoanPrinter.php to work with phpunit 10+

Due to the latest updates to PHP 8.1, running the koan using php contemplate_koans is not working anymore, see picture below:

We can improve the way koans are executed and we can simplify the project by avoiding running the koans using contemplate and run them using phpunit.