--TEST-- Single Application can be executed --FILE-- <?php use Symfony\Component\Console\Input\InputInterface; use Symfony\Component\Console\Output\OutputInterface; use Symfony\Component\Console\SingleCommandApplication; $vendor = __DIR__; while (!file_exists($vendor.'/vendor')) { $vendor = dirname($vendor); } require $vendor.'/vendor/autoload.php'; (new SingleCommandApplication()) ->setCode(function (InputInterface $input, OutputInterface $output): int { $output->writeln('Hello World!'); return 0; }) ->run() ; ?> --EXPECT-- Hello World!