doctrine2/tests/lib/Doctrine_TestUtil.php

<?php 

class Doctrine_TestUtil
{    
    public static function getConnection()
    {
        if (isset($GLOBALS['db_type'], $GLOBALS['db_username'], $GLOBALS['db_password'],
                $GLOBALS['db_host'], $GLOBALS['db_name'])) {
            $params = array(
                'driver' => $GLOBALS['db_type'],
                'user' => $GLOBALS['db_username'],
                'password' => $GLOBALS['db_password'],
                'host' => $GLOBALS['db_host'],
                'database' => $GLOBALS['db_name']
            );
        } else {
            $params = array(
                'driver' => 'pdo_sqlite',
                'memory' => true
            );
        }
        
        return Doctrine_DBAL_DriverManager::getConnection($params);
    }
}