PluginManagerCacheClearer.php

<?php

declare (strict_types=1);
namespace Drupal\module_test;

use Drupal\Core\Plugin\DefaultPluginManager;
use Drupal\Core\State\StateInterface;

/**
 * Helps test module uninstall.
 */
class PluginManagerCacheClearer extends DefaultPluginManager {
  
  /**
   * PluginManagerCacheClearer constructor.
   *
   * @param \Drupal\Core\State\StateInterface $state
   *   The state service for recording what happens.
   * @param null $optionalService
   *   An optional service for testing.
   */
  public function __construct(protected StateInterface $state, protected $optionalService = NULL) {
  }
  
  /**
   * Tests call to CachedDiscoveryInterface::clearCachedDefinitions().
   *
   * @see \Drupal\Component\Plugin\Discovery\CachedDiscoveryInterface::clearCachedDefinitions()
   */
  public function clearCachedDefinitions() : void {
    $this->state
      ->set(self::class, isset($this->optionalService));
  }

}