muzich/vendor/doctrine-dbal/tests/Doctrine/Tests/DbalFunctionalTestCase.php

<?php

namespace Doctrine\Tests;

class DbalFunctionalTestCase extends DbalTestCase
{
    /**
     * Shared connection when a TestCase is run alone (outside of it's functional suite)
     *
     * @var \Doctrine\DBAL\Connection
     */
    private static $_sharedConn;

    /**
     * @var \Doctrine\DBAL\Connection
     */
    protected $_conn;

    protected function resetSharedConn()
    {
        if (self::$_sharedConn) {
            self::$_sharedConn->close();
            self::$_sharedConn = null;
        }
    }

    protected function setUp()
    {
        if ( ! isset(self::$_sharedConn)) {
            self::$_sharedConn = TestUtil::getConnection();
        }
        $this->_conn = self::$_sharedConn;
    }
}