Orange.php

<?php

/**
 * @file
 * Definition of Drupal\plugin_test\Plugin\plugin_test\fruit\Orange.
 */
namespace Drupal\plugin_test\Plugin\plugin_test\fruit;

use Drupal\Component\Annotation\Plugin;

/**
 * @Plugin(
 *   id = "orange",
 *   label = "Orange",
 *   color = "orange"
 * )
 */
class Orange {

}