Unknown option "--results-files"

[codders]

Not sure if I'm using the tool correctly, but when I run:

phpunit --cache-result --results-files=.phpunit.cache/test-results*

per the README, I get the message Unknown option "--results-files" from PHPUnit. I have installed the package using:

composer require --dev previousnext/phpunit-splitter:dev-main

and I see the phpunit-splitter file in ./vendor/bin. Is there something else I need to do there?

[dafeder]

I'm trying to get this working as well, I believe the correct option is --cache-result-file