Fix PHP Warning: serialize() in tests on PHP 8

🐛 Automatic Updates & Package Manager should use DependencySerializationTrait when needed Closed: outdated is solved, time to continue here! 😊

This piffling pipsqueak of a bug is due to the fact that I had used a mocked TranslatableMarkup in ScaffoldFilePermissionsTest a long time ago. (I didn't mock the __sleep method, so it's just returning null.)

Since we're using t() in tests and data providers now, I'm just gonna go ahead and use a real summary, rather than a mock. That fixes the problem; see https://dispatcher.drupalci.org/job/drupal8_contrib_patches/144991/console and notice that there is no complaint about __sleep not returning an array.

piffling pipsqueak of a bug

🤣

Wow. I clearly never even got close to finding this one — nice detective work! 👍

Automatically closed - issue fixed for 2 weeks with no activity.