class CategorizingPluginManager

class CategorizingPluginManager extends DefaultPluginManager implements CategorizingPluginManagerInterface {
  use CategorizingPluginManagerTrait;
  
  /**
   * Replace the constructor so we can instantiate a stub.
   *
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   * @param \Drupal\Core\Extension\ModuleExtensionList $module_extension_list
   *   The module extension list.
   */
  public function __construct(ModuleHandlerInterface $module_handler, ModuleExtensionList $module_extension_list) {
    $this->moduleHandler = $module_handler;
    $this->moduleExtensionList = $module_extension_list;
  }
  
  /**
   * {@inheritdoc}
   *
   * Provides some test definitions to the trait.
   */
  public function getDefinitions() : array {
    return [
      'cucumber' => [
        'label' => 'cucumber',
        'category' => 'vegetables',
      ],
      'apple' => [
        'label' => 'apple',
        'category' => 'fruits',
      ],
      'mango' => [
        'label' => 'mango',
        'category' => 'fruits',
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function processDefinition(&$definition, $plugin_id) : void {
    parent::processDefinition($definition, $plugin_id);
    $this->processDefinitionCategory($definition);
  }

}