EntityTestContainerFactoryPlugin.php

<?php

namespace Drupal\entity_test\Plugin\Validation\Constraint;

use Drupal\Component\Plugin\PluginBase;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * A dummy constraint for testing \Drupal\Core\Validation\ConstraintFactory.
 */
class EntityTestContainerFactoryPlugin extends PluginBase implements ContainerFactoryPluginInterface {
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition);
    }

}