PathProcessorDecode example

// Create a user stub.     $current_user = $this->getMockBuilder('Drupal\Core\Session\AccountInterface')
      ->getMock();

    // Create a config event subscriber stub.     $config_subscriber = $this->getMockBuilder('Drupal\language\EventSubscriber\ConfigSubscriber')
      ->disableOriginalConstructor()
      ->getMock();

    // Create the processors.     $alias_processor = new AliasPathProcessor($alias_manager);
    $decode_processor = new PathProcessorDecode();
    $front_processor = new PathProcessorFront($config_factory_stub);
    $language_processor = new PathProcessorLanguage($config_factory_stub, $this->languageManager, $negotiator, $current_user, $config_subscriber);

    // First, test the processor manager with the processors in the incorrect     // order. The alias processor will run before the language processor, meaning     // aliases will not be found.     $priorities = [
      1000 => $alias_processor,
      500 => $decode_processor,
      300 => $front_processor,
      200 => $language_processor,
    ];