TestTextfieldWidget.php

<?php

declare (strict_types=1);
namespace Drupal\field_plugins_test\Plugin\Field\FieldWidget;

use Drupal\Core\Field\Attribute\FieldWidget;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\text\Plugin\Field\FieldWidget\TextfieldWidget;

/**
 * Plugin implementation of the 'field_plugins_test_text_widget' widget.
 */
class TestTextfieldWidget extends TextfieldWidget {

}