public function testOutputWithoutVersion()
{
$container = new ContainerBuilder();
$container->setParameter('kernel.packages', []);
$command = new VersionCommand('contao:version');
$command->setContainer($container);
$tester = new CommandTester($command);
$code = $tester->execute([]);
$this->assertEquals(1, $code);
$this->assertEquals('', $tester->getDisplay());
}