doctrine2/tests/Doctrine/Tests/ORM/Mapping/YamlMappingDriverTest.php

<?php

namespace Doctrine\Tests\ORM\Mapping;

use Doctrine\ORM\Mapping\ClassMetadata,
    Doctrine\ORM\Mapping\Driver\XmlDriver,
    Doctrine\ORM\Mapping\Driver\YamlDriver;

require_once __DIR__ . '/../../TestInit.php';

class YamlMappingDriverTest extends AbstractMappingDriverTest
{
    protected function _loadDriver()
    {
        if (!class_exists('Symfony\Components\Yaml\Yaml', true)) {
            $this->markTestSkipped('Please install Symfony YAML Component into the include path of your PHP installation.');
        }

        return new YamlDriver(__DIR__ . DIRECTORY_SEPARATOR . 'yaml');
    }
}