Edit: IsbnValidatorTest.php

Editing: IsbnValidatorTest.php

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<?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\Validator\Tests\Constraints;

use Symfony\Component\Validator\Constraints\Isbn;
use Symfony\Component\Validator\Constraints\IsbnValidator;

/**
 * @see https://en.wikipedia.org/wiki/Isbn
 */
class IsbnValidatorTest extends \PHPUnit_Framework_TestCase
{
    protected $context;
    protected $validator;

public function setUp()
    {
        $this->context = $this->getMock('Symfony\Component\Validator\ExecutionContext', array(), array(), '', false);
        $this->validator = new IsbnValidator();
        $this->validator->initialize($this->context);
    }

public function getValidIsbn10()
    {
        return array(
            array('2723442284'),
            array('2723442276'),
            array('2723455041'),
            array('2070546810'),
            array('2711858839'),
            array('2756406767'),
            array('2870971648'),
            array('226623854X'),
            array('2851806424'),
            array('0321812700'),
            array('0-45122-5244'),
            array('0-4712-92311'),
        );
    }

public function getInvalidIsbn10()
    {
        return array(
            array('1234567890'),
            array('987'),
            array('0987656789'),
            array(0),
            array('7-35622-5444'),
            array('0-4X19-92611'),
            array('0_45122_5244'),
            array('2870#971#648'),
        );
    }

public function getValidIsbn13()
    {
        return array(
            array('978-2723442282'),
            array('978-2723442275'),
            array('978-2723455046'),
            array('978-2070546817'),
            array('978-2711858835'),
            array('978-2756406763'),
            array('978-2870971642'),
            array('978-2266238540'),
            array('978-2851806420'),
            array('978-0321812704'),
            array('978-0451225245'),
            array('978-0471292319'),
        );
    }

public function getInvalidIsbn13()
    {
        return array(
            array('1234567890'),
            array('987'),
            array('0987656789'),
            array(0),
            array('0-4X19-9261981'),
            array('978-0321513774'),
            array('979-0431225385'),
            array('980-0474292319'),
            array('978_0451225245'),
            array('978#0471292319'),
        );
    }

public function getValidIsbn()
    {
        return array_merge(
            $this->getValidIsbn10(),
            $this->getValidIsbn13()
        );
    }

public function getInvalidIsbn()
    {
        return array_merge(
            $this->getInvalidIsbn10(),
            $this->getInvalidIsbn13()
        );
    }

public function testNullIsValid()
    {
        $constraint = new Isbn(true);
        $this->context
            ->expects($this->never())
            ->method('addViolation');

$this->validator->validate(null, $constraint);
    }

public function testEmptyStringIsValid()
    {
        $constraint = new Isbn(true);
        $this->context
            ->expects($this->never())
            ->method('addViolation');

$this->validator->validate('', $constraint);
    }

/**
     * @expectedException \Symfony\Component\Validator\Exception\UnexpectedTypeException
     */
    public function testExpectsStringCompatibleType()
    {
        $constraint = new Isbn(true);
        $this->validator->validate(new \stdClass(), $constraint);
    }

/**
     * @dataProvider getValidIsbn10
     */
    public function testValidIsbn10($isbn)
    {
        $constraint = new Isbn(array('isbn10' => true));
        $this->context
            ->expects($this->never())
            ->method('addViolation');