TestingHooksProfile.php

<?php

declare (strict_types=1);
namespace Drupal\testing_hooks\Hook;

use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementation on behalf of another module.
 */
class TestingHooksProfile {
    
    /**
     * Implements hook_module_preinstall().
     */
    public function flush() : void {
        // Set a global value we can check in test code.
        $GLOBALS['profile_oop'] = 'profile_oop';
    }

}