The conventional structure of /tests/TestCase that mirrored that of /src has been replaced with putting all unit tests into a single, flat directory. Avoiding the directory structure that reflects each class's namespace is going to make the codebase harder to manage and may interfere with autoloading.
Speaking of autoloading, CommentariesTableTest.php has the namespace App\Test\TestCase\Controller, which doesn't reflect what kind of class it is or what directory it's in.
/tests/TestCasethat mirrored that of/srchas been replaced with putting all unit tests into a single, flat directory. Avoiding the directory structure that reflects each class's namespace is going to make the codebase harder to manage and may interfere with autoloading.CommentariesTableTest.phphas the namespaceApp\Test\TestCase\Controller, which doesn't reflect what kind of class it is or what directory it's in.