<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Tests\Helper;

use PHPUnit\Framework\TestCase;
use Symfony\Component\Console\Formatter\OutputFormatter;
use Symfony\Component\Console\Helper\FormatterHelper;
use Symfony\Component\Console\Helper\HelperSet;
use Symfony\Component\Console\Helper\QuestionHelper;
use Symfony\Component\Console\Output\StreamOutput;
use Symfony\Component\Console\Question\ChoiceQuestion;
use Symfony\Component\Console\Question\ConfirmationQuestion;
use Symfony\Component\Console\Question\Question;

/**
 * @group tty
 */
class QuestionHelperTest extends TestCase
{
    public function testAskChoice()
    {
        $questionHelper = new QuestionHelper();

        $helperSet = new HelperSet(array(new FormatterHelper()));
        $questionHelper->setHelperSet($helperSet);

        $heroes = array('Superman', 'Batman', 'Spiderman');

        $questionHelper->setInputStream($this->getInputStream("\n1\n  1  \nFabien\n1\nFabien\n1\n0,2\n 0 , 2  \n\n\n"));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, '2');
        $question->setMaxAttempts(1);
        // first answer is an empty answer, we're supposed to receive the default value
        $this->assertEquals('Spiderman', $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes);
        $question->setMaxAttempts(1);
        $this->assertEquals('Batman', $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('Batman', $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes);
        $question->setErrorMessage('Input "%s" is not a superhero!');
        $question->setMaxAttempts(2);
        $this->assertEquals('Batman', $questionHelper->ask($this->createInputInterfaceMock(), $output = $this->createOutputInterface(), $question));

        rewind($output->getStream());
        $stream = stream_get_contents($output->getStream());
        $this->assertContains('Input "Fabien" is not a superhero!', $stream);

        try {
            $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, '1');
            $question->setMaxAttempts(1);
            $questionHelper->ask($this->createInputInterfaceMock(), $output = $this->createOutputInterface(), $question);
            $this->fail();
        } catch (\InvalidArgumentException $e) {
            $this->assertEquals('Value "Fabien" is invalid', $e->getMessage());
        }

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, null);
        $question->setMaxAttempts(1);
        $question->setMultiselect(true);

        $this->assertEquals(array('Batman'), $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals(array('Superman', 'Spiderman'), $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals(array('Superman', 'Spiderman'), $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, '0,1');
        $question->setMaxAttempts(1);
        $question->setMultiselect(true);

        $this->assertEquals(array('Superman', 'Batman'), $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, ' 0 , 1 ');
        $question->setMaxAttempts(1);
        $question->setMultiselect(true);

        $this->assertEquals(array('Superman', 'Batman'), $questionHelper->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, 0);
        // We are supposed to get the default value since we are not in interactive mode
        $this->assertEquals('Superman', $questionHelper->ask($this->createInputInterfaceMock(true), $this->createOutputInterface(), $question));
    }

    public function testAskChoiceNonInteractive()
    {
        $questionHelper = new QuestionHelper();

        $helperSet = new HelperSet(array(new FormatterHelper()));
        $questionHelper->setHelperSet($helperSet);
        $questionHelper->setInputStream($this->getInputStream("\n1\n  1  \nFabien\n1\nFabien\n1\n0,2\n 0 , 2  \n\n\n"));

        $heroes = array('Superman', 'Batman', 'Spiderman');

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, '0');

        $this->assertSame('Superman', $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, 'Batman');
        $this->assertSame('Batman', $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, null);
        $this->assertNull($questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, '0');
        $question->setValidator(null);
        $this->assertSame('Superman', $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        try {
            $question = new ChoiceQuestion('What is your favorite superhero?', $heroes, null);
            $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question);
        } catch (\InvalidArgumentException $e) {
            $this->assertSame('Value "" is invalid', $e->getMessage());
        }

        $question = new ChoiceQuestion('Who are your favorite superheros?', $heroes, '0, 1');
        $question->setMultiselect(true);
        $this->assertSame(array('Superman', 'Batman'), $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('Who are your favorite superheros?', $heroes, '0, 1');
        $question->setMultiselect(true);
        $question->setValidator(null);
        $this->assertSame(array('Superman', 'Batman'), $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('Who are your favorite superheros?', $heroes, '0, Batman');
        $question->setMultiselect(true);
        $this->assertSame(array('Superman', 'Batman'), $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        $question = new ChoiceQuestion('Who are your favorite superheros?', $heroes, null);
        $question->setMultiselect(true);
        $this->assertNull($questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));

        try {
            $question = new ChoiceQuestion('Who are your favorite superheros?', $heroes, '');
            $question->setMultiselect(true);
            $questionHelper->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question);
        } catch (\InvalidArgumentException $e) {
            $this->assertSame('Value "" is invalid', $e->getMessage());
        }
    }

    public function testAsk()
    {
        $dialog = new QuestionHelper();

        $dialog->setInputStream($this->getInputStream("\n8AM\n"));

        $question = new Question('What time is it?', '2PM');
        $this->assertEquals('2PM', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $question = new Question('What time is it?', '2PM');
        $this->assertEquals('8AM', $dialog->ask($this->createInputInterfaceMock(), $output = $this->createOutputInterface(), $question));

        rewind($output->getStream());
        $this->assertEquals('What time is it?', stream_get_contents($output->getStream()));
    }

    public function testAskWithAutocomplete()
    {
        if (!$this->hasSttyAvailable()) {
            $this->markTestSkipped('`stty` is required to test autocomplete functionality');
        }

        // Acm<NEWLINE>
        // Ac<BACKSPACE><BACKSPACE>s<TAB>Test<NEWLINE>
        // <NEWLINE>
        // <UP ARROW><UP ARROW><NEWLINE>
        // <UP ARROW><UP ARROW><UP ARROW><UP ARROW><UP ARROW><TAB>Test<NEWLINE>
        // <DOWN ARROW><NEWLINE>
        // S<BACKSPACE><BACKSPACE><DOWN ARROW><DOWN ARROW><NEWLINE>
        // F00<BACKSPACE><BACKSPACE>oo<TAB><NEWLINE>
        $inputStream = $this->getInputStream("Acm\nAc\177\177s\tTest\n\n\033[A\033[A\n\033[A\033[A\033[A\033[A\033[A\tTest\n\033[B\nS\177\177\033[B\033[B\nF00\177\177oo\t\n");

        $dialog = new QuestionHelper();
        $dialog->setInputStream($inputStream);
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new Question('Please select a bundle', 'FrameworkBundle');
        $question->setAutocompleterValues(array('AcmeDemoBundle', 'AsseticBundle', 'SecurityBundle', 'FooBundle'));

        $this->assertEquals('AcmeDemoBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AsseticBundleTest', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FrameworkBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('SecurityBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FooBundleTest', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AcmeDemoBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AsseticBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FooBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

    public function testAskWithAutocompleteWithNonSequentialKeys()
    {
        if (!$this->hasSttyAvailable()) {
            $this->markTestSkipped('`stty` is required to test autocomplete functionality');
        }

        // <UP ARROW><UP ARROW><NEWLINE><DOWN ARROW><DOWN ARROW><NEWLINE>
        $inputStream = $this->getInputStream("\033[A\033[A\n\033[B\033[B\n");

        $dialog = new QuestionHelper();
        $dialog->setInputStream($inputStream);
        $dialog->setHelperSet(new HelperSet(array(new FormatterHelper())));

        $question = new ChoiceQuestion('Please select a bundle', array(1 => 'AcmeDemoBundle', 4 => 'AsseticBundle'));
        $question->setMaxAttempts(1);

        $this->assertEquals('AcmeDemoBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AsseticBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

    public function testAskWithAutocompleteWithExactMatch()
    {
        if (!$this->hasSttyAvailable()) {
            $this->markTestSkipped('`stty` is required to test autocomplete functionality');
        }

        $inputStream = $this->getInputStream("b\n");

        $possibleChoices = array(
            'a' => 'berlin',
            'b' => 'copenhagen',
            'c' => 'amsterdam',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($inputStream);
        $dialog->setHelperSet(new HelperSet(array(new FormatterHelper())));

        $question = new ChoiceQuestion('Please select a city', $possibleChoices);
        $question->setMaxAttempts(1);

        $this->assertSame('b', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

    public function testAutocompleteWithTrailingBackslash()
    {
        if (!$this->hasSttyAvailable()) {
            $this->markTestSkipped('`stty` is required to test autocomplete functionality');
        }

        $inputStream = $this->getInputStream('E');

        $dialog = new QuestionHelper();
        $dialog->setInputStream($inputStream);
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new Question('');
        $expectedCompletion = 'ExampleNamespace\\';
        $question->setAutocompleterValues(array($expectedCompletion));

        $output = $this->createOutputInterface();
        $dialog->ask($this->createInputInterfaceMock(), $output, $question);

        $outputStream = $output->getStream();
        rewind($outputStream);
        $actualOutput = stream_get_contents($outputStream);

        // Shell control (esc) sequences are not so important: we only care that
        // <hl> tag is interpreted correctly and replaced
        $irrelevantEscSequences = array(
            "\0337" => '', // Save cursor position
            "\0338" => '', // Restore cursor position
            "\033[K" => '', // Clear line from cursor till the end
        );

        $importantActualOutput = strtr($actualOutput, $irrelevantEscSequences);

        // Remove colors (e.g. "\033[30m", "\033[31;41m")
        $importantActualOutput = preg_replace('/\033\[\d+(;\d+)?m/', '', $importantActualOutput);

        $this->assertEquals($expectedCompletion, $importantActualOutput);
    }

    public function testAskHiddenResponse()
    {
        if ('\\' === \DIRECTORY_SEPARATOR) {
            $this->markTestSkipped('This test is not supported on Windows');
        }

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream("8AM\n"));

        $question = new Question('What time is it?');
        $question->setHidden(true);

        $this->assertEquals('8AM', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

    /**
     * @dataProvider getAskConfirmationData
     */
    public function testAskConfirmation($question, $expected, $default = true)
    {
        $dialog = new QuestionHelper();

        $dialog->setInputStream($this->getInputStream($question."\n"));
        $question = new ConfirmationQuestion('Do you like French fries?', $default);
        $this->assertEquals($expected, $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question), 'confirmation question should '.($expected ? 'pass' : 'cancel'));
    }

    public function getAskConfirmationData()
    {
        return array(
            array('', true),
            array('', false, false),
            array('y', true),
            array('yes', true),
            array('n', false),
            array('no', false),
        );
    }

    public function testAskConfirmationWithCustomTrueAnswer()
    {
        $dialog = new QuestionHelper();

        $dialog->setInputStream($this->getInputStream("j\ny\n"));
        $question = new ConfirmationQuestion('Do you like French fries?', false, '/^(j|y)/i');
        $this->assertTrue($dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $question = new ConfirmationQuestion('Do you like French fries?', false, '/^(j|y)/i');
        $this->assertTrue($dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

    public function testAskAndValidate()
    {
        $dialog = new QuestionHelper();
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $error = 'This is not a color!';
        $validator = function ($color) use ($error) {
            if (!\in_array($color, array('white', 'black'))) {
                throw new \InvalidArgumentException($error);
            }

            return $color;
        };

        $question = new Question('What color was the white horse of Henry IV?', 'white');
        $question->setValidator($validator);
        $question->setMaxAttempts(2);

        $dialog->setInputStream($this->getInputStream("\nblack\n"));
        $this->assertEquals('white', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('black', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));

        $dialog->setInputStream($this->getInputStream("green\nyellow\norange\n"));
        try {
            $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);
            $this->fail();
        } catch (\InvalidArgumentException $e) {
            $this->assertEquals($error, $e->getMessage());
        }
    }

    /**
     * @dataProvider simpleAnswerProvider
     */
    public function testSelectChoiceFromSimpleChoices($providedAnswer, $expectedValue)
    {
        $possibleChoices = array(
            'My environment 1',
            'My environment 2',
            'My environment 3',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream($providedAnswer."\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new ChoiceQuestion('Please select the environment to load', $possibleChoices);
        $question->setMaxAttempts(1);
        $answer = $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);

        $this->assertSame($expectedValue, $answer);
    }

    public function simpleAnswerProvider()
    {
        return array(
            array(0, 'My environment 1'),
            array(1, 'My environment 2'),
            array(2, 'My environment 3'),
            array('My environment 1', 'My environment 1'),
            array('My environment 2', 'My environment 2'),
            array('My environment 3', 'My environment 3'),
        );
    }

    /**
     * @dataProvider specialCharacterInMultipleChoice
     */
    public function testSpecialCharacterChoiceFromMultipleChoiceList($providedAnswer, $expectedValue)
    {
        $possibleChoices = array(
            '.',
            'src',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream($providedAnswer."\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new ChoiceQuestion('Please select the directory', $possibleChoices);
        $question->setMaxAttempts(1);
        $question->setMultiselect(true);
        $answer = $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);

        $this->assertSame($expectedValue, $answer);
    }

    public function specialCharacterInMultipleChoice()
    {
        return array(
            array('.', array('.')),
            array('., src', array('.', 'src')),
        );
    }

    /**
     * @dataProvider mixedKeysChoiceListAnswerProvider
     */
    public function testChoiceFromChoicelistWithMixedKeys($providedAnswer, $expectedValue)
    {
        $possibleChoices = array(
            '0' => 'No environment',
            '1' => 'My environment 1',
            'env_2' => 'My environment 2',
            3 => 'My environment 3',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream($providedAnswer."\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new ChoiceQuestion('Please select the environment to load', $possibleChoices);
        $question->setMaxAttempts(1);
        $answer = $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);

        $this->assertSame($expectedValue, $answer);
    }

    public function mixedKeysChoiceListAnswerProvider()
    {
        return array(
            array('0', '0'),
            array('No environment', '0'),
            array('1', '1'),
            array('env_2', 'env_2'),
            array(3, '3'),
            array('My environment 1', '1'),
        );
    }

    /**
     * @dataProvider answerProvider
     */
    public function testSelectChoiceFromChoiceList($providedAnswer, $expectedValue)
    {
        $possibleChoices = array(
            'env_1' => 'My environment 1',
            'env_2' => 'My environment',
            'env_3' => 'My environment',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream($providedAnswer."\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new ChoiceQuestion('Please select the environment to load', $possibleChoices);
        $question->setMaxAttempts(1);
        $answer = $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);

        $this->assertSame($expectedValue, $answer);
    }

    /**
     * @expectedException        \InvalidArgumentException
     * @expectedExceptionMessage The provided answer is ambiguous. Value should be one of env_2 or env_3.
     */
    public function testAmbiguousChoiceFromChoicelist()
    {
        $possibleChoices = array(
            'env_1' => 'My first environment',
            'env_2' => 'My environment',
            'env_3' => 'My environment',
        );

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream("My environment\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new ChoiceQuestion('Please select the environment to load', $possibleChoices);
        $question->setMaxAttempts(1);

        $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);
    }

    public function answerProvider()
    {
        return array(
            array('env_1', 'env_1'),
            array('env_2', 'env_2'),
            array('env_3', 'env_3'),
            array('My environment 1', 'env_1'),
        );
    }

    public function testNoInteraction()
    {
        $dialog = new QuestionHelper();
        $question = new Question('Do you have a job?', 'not yet');
        $this->assertEquals('not yet', $dialog->ask($this->createInputInterfaceMock(false), $this->createOutputInterface(), $question));
    }

    /**
     * @requires function mb_strwidth
     */
    public function testChoiceOutputFormattingQuestionForUtf8Keys()
    {
        $question = 'Lorem ipsum?';
        $possibleChoices = array(
            'foo' => 'foo',
            'żółw' => 'bar',
            'łabądź' => 'baz',
        );
        $outputShown = array(
            $question,
            '  [<info>foo   </info>] foo',
            '  [<info>żółw  </info>] bar',
            '  [<info>łabądź</info>] baz',
        );
        $output = $this->getMockBuilder('\Symfony\Component\Console\Output\OutputInterface')->getMock();
        $output->method('getFormatter')->willReturn(new OutputFormatter());

        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream("\n"));
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $output->expects($this->once())->method('writeln')->with($this->equalTo($outputShown));

        $question = new ChoiceQuestion($question, $possibleChoices, 'foo');
        $dialog->ask($this->createInputInterfaceMock(), $output, $question);
    }

    /**
     * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
     * @expectedExceptionMessage Aborted
     */
    public function testAskThrowsExceptionOnMissingInput()
    {
        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream(''));

        $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), new Question('What\'s your name?'));
    }

    /**
     * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
     * @expectedExceptionMessage Aborted
     */
    public function testAskThrowsExceptionOnMissingInputWithValidator()
    {
        $dialog = new QuestionHelper();
        $dialog->setInputStream($this->getInputStream(''));

        $question = new Question('What\'s your name?');
        $question->setValidator(function () {
            if (!$value) {
                throw new \Exception('A value is required.');
            }
        });

        $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question);
    }

    /**
     * @expectedException \LogicException
     * @expectedExceptionMessage Choice question must have at least 1 choice available.
     */
    public function testEmptyChoices()
    {
        new ChoiceQuestion('Question', array(), 'irrelevant');
    }

    public function testTraversableAutocomplete()
    {
        if (!$this->hasSttyAvailable()) {
            $this->markTestSkipped('`stty` is required to test autocomplete functionality');
        }

        // Acm<NEWLINE>
        // Ac<BACKSPACE><BACKSPACE>s<TAB>Test<NEWLINE>
        // <NEWLINE>
        // <UP ARROW><UP ARROW><NEWLINE>
        // <UP ARROW><UP ARROW><UP ARROW><UP ARROW><UP ARROW><TAB>Test<NEWLINE>
        // <DOWN ARROW><NEWLINE>
        // S<BACKSPACE><BACKSPACE><DOWN ARROW><DOWN ARROW><NEWLINE>
        // F00<BACKSPACE><BACKSPACE>oo<TAB><NEWLINE>
        $inputStream = $this->getInputStream("Acm\nAc\177\177s\tTest\n\n\033[A\033[A\n\033[A\033[A\033[A\033[A\033[A\tTest\n\033[B\nS\177\177\033[B\033[B\nF00\177\177oo\t\n");

        $dialog = new QuestionHelper();
        $dialog->setInputStream($inputStream);
        $helperSet = new HelperSet(array(new FormatterHelper()));
        $dialog->setHelperSet($helperSet);

        $question = new Question('Please select a bundle', 'FrameworkBundle');
        $question->setAutocompleterValues(new AutocompleteValues(array('irrelevant' => 'AcmeDemoBundle', 'AsseticBundle', 'SecurityBundle', 'FooBundle')));

        $this->assertEquals('AcmeDemoBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AsseticBundleTest', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FrameworkBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('SecurityBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FooBundleTest', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AcmeDemoBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('AsseticBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
        $this->assertEquals('FooBundle', $dialog->ask($this->createInputInterfaceMock(), $this->createOutputInterface(), $question));
    }

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

        return $stream;
    }

    protected function createOutputInterface()
    {
        return new StreamOutput(fopen('php://memory', 'r+', false));
    }

    protected function createInputInterfaceMock($interactive = true)
    {
        $mock = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')->getMock();
        $mock->expects($this->any())
            ->method('isInteractive')
            ->will($this->returnValue($interactive));

        return $mock;
    }

    private function hasSttyAvailable()
    {
        exec('stty 2>&1', $output, $exitcode);

        return 0 === $exitcode;
    }
}

class AutocompleteValues implements \IteratorAggregate
{
    private $values;

    public function __construct(array $values)
    {
        $this->values = $values;
    }

    public function getIterator()
    {
        return new \ArrayIterator($this->values);
    }
}
