Symfony interactive Command Test ends with RuntimeException

Question

I'm trying to test my console command with interactive input. So i wrote a function to change the inputstream of the question helper.

protected function getInputStream($input)
{
    $stream = fopen('php://memory', 'r+', false);
    fwrite($stream, $input);
    rewind($stream);

    return $stream;
}

Here is my code that fails

public function testRunCommandWithoutArguments()
{
    self::bootKernel();
    $application = new Application(self::$kernel);
    $application->setAutoExit(false);
    $application->add(new InstallCommand());

    $command = $application->find('app:install');
    $commandTester = new CommandTester($command);
    $helper = $command->getHelper('question');
    /** @var QuestionHelper $helper */
    $helper->setInputStream($this->getInputStream('No\\nNo\\n'));

    $commandTester->execute(array('command' => $command->getName()));
}

RuntimeException : Aborted /Users/Ashura/Documents/Projects/CustomFramework/vendor/symfony/symfony/src/Symfony/Component/Console/Helper/QuestionHelper.php:135 /Users/Ashura/Documents/Projects/CustomFramework/vendor/symfony/symfony/src/Symfony/Component/Console/Helper/QuestionHelper.php:56 /Users/Ashura/Documents/Projects/CustomFramework/src/AppBundle/Command/InstallCommand.php:96 /Users/Ashura/Documents/Projects/CustomFramework/vendor/symfony/symfony/src/Symfony/Component/Console/Command/Command.php:256 /Users/Ashura/Documents/Projects/CustomFramework/vendor/symfony/symfony/src/Symfony/Component/Console/Tester/CommandTester.php:80 /Users/Ashura/Documents/Projects/CustomFramework/tests/AppBundle/Command/InstallCommandTest.php:79

Answer 1

\n in single quote don't work, they are displayed in a print for instance.

Change 'No\\nNo\\n' to "No\nNo\n" and it should work.

Another I prefer: sprintf('No%1$sNo%1$s', PHP_EOL)