CAlterHooks.php

<?php

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

use Drupal\Core\Hook\Attribute\Hook;

/**
 * This class contains hook implementations.
 *
 * By default, these will be called in module order, which is predictable due
 * to the alphabetical module names. Some of the implementations are reordered
 * using order attributes.
 */
class CAlterHooks {
  public function testAlter(array &$calls) : void {
    $calls[] = __METHOD__;
  }
  public function testSubtypeAlter(array &$calls) : void {
    $calls[] = __METHOD__;
  }

}