ErrorContainer.php

<?php

declare (strict_types=1);
namespace Drupal\FunctionalTests\Bootstrap;

use Drupal\Core\DependencyInjection\Container;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Container base class which triggers an error.
 */
class ErrorContainer extends Container {
    
    /**
     * {@inheritdoc}
     */
    public function get($id, $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE) : ?object {
        if ($id === 'http_kernel') {
            // Enforce a recoverable error.
            $callable = function (ErrorContainer $container) {
            };
            return $callable(1);
        }
        return parent::get($id, $invalidBehavior);
    }

}