PHPUnit has a faster release cadence than Drupal and drops support for PHP versions quicker than we do. See https://phpunit.de/supported-versions.html. This leads to issues like:
We're also always playing catch up and have to do issues like #2950132: Support PHPUnit 7 optionally in Drupal 8, while keeping support for ^6.5 → .
Symfony does not include phpunit in its composer.json. Instead it uses a custom PHPUnit runner called simple-phpunit that selects the correct PHPUnit version for the PHP version you are running on. It exists to:
Provides a modified version of PHPUnit that does not embed symfony/yaml nor prophecy to prevent any conflicts with these dependencies.
https://symfony.com/doc/current/components/phpunit_bridge.html
TBD
TDB
None
@todo
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I still think we have problems with the PHPUnit tail wagging the Drupal dog and removing PHPUnit from the dependency chain would be great. There's always a tension about having dependencies on tools.
That said I think closing this task is okay as no one is actively working on this.