use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\QuestionHelper;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\Question;
use Symfony\Component\Console\Tester\ApplicationTester;

require './vendor/autoload.php';

class QuestionCommand extends Command
{
    protected function configure(): void
    {
        $this->setDescription('A command that asks a question');
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $question = new Question('This is a promptable question');
        $question->setValidator(function ($value) {
            if (! preg_match('/^[A-Z][A-Za-z0-9_]+$/', $value)) {
                throw new RuntimeException('Question requires a valid class name');
            }
            return $value;
        });

        /** @var QuestionHelper $helper */
        $helper = $this->getHelper('question');
        $class = $helper->ask($input, $output, $question);

        $output->writeln(sprintf('<info>%s</info>', $class));

        return 0;
    }
}

$application = new Application('test');
$application->add(new QuestionCommand('question'));
$application->setAutoExit(false);

$tester = new ApplicationTester($application);
$tester->setInputs(['', 'not-a-class', 'also not a class', 'FinallyAClass']);

$statusCode = $tester->run(
    ['command' => 'question'],
    ['interactive' => true]
);

printf("Status code: %d\n", $statusCode);

while (null === $attempts || $attempts--)

$attempts = $attempts ?? -(int) $this->isTty();

$attempts = $attempts === null ? null : -(int) $this->isTtty();