# app/AppKernel.php

    /**
     * Обходим принудительное закрытие коннекта
     *
     * @see https://github.com/doctrine/DoctrineBundle/issues/407
     *
     * {@inheritdoc}
     *
     * @api
     */
    public function shutdown()
    {
        if (false === $this->booted) {
            return;
        }

        $this->booted = false;

        foreach ($this->getBundles() as $bundle) {
            /**
             * Вмешиваемся только в один класс и только в тестовой среде окружения
             */
            if ($bundle instanceof Doctrine\Bundle\DoctrineBundle\DoctrineBundle && ('test' === $this->getEnvironment())) {
                /**
                 * Используем замыкание для доступа к приватной переменной DoctrineBundle->autoloader
                 * @see http://habrahabr.ru/post/186718/
                 */
                $doctrineShutdown = Closure::bind(
                    function () {
                        if (null !== $this->autoloader) {
                            spl_autoload_unregister($this->autoloader);
                            $this->autoloader = null;
                        }
                    },
                    $bundle,
                    'Doctrine\Bundle\DoctrineBundle\DoctrineBundle'
                );
                $doctrineShutdown();
            } else {
                $bundle->shutdown();
            }

            $bundle->setContainer(null);
        }

        $this->container = null;
    }

<?php

namespace AppBundle\Framework;

use Doctrine\DBAL\Connections\MasterSlaveConnection;
use Exception;

// Decorates a connection to disable $connection->close()
//
// Every test we run is isolated within a DB transaction.
//
// However Doctrine closes all connections on kernel shutdown.
//
// This is a problem because in some tests the kernel is booted
// and shutdown multiple times (e.g. when using the WebTest client)
// which means Doctrine is closing the active transaction
// established in TestDatabaseConnectionFactory
//
// To work around the issue we stop the connection from being closed
//
// Also see https://github.com/doctrine/DoctrineBundle/issues/407
class TestDatabaseConnection extends MasterSlaveConnection
{
    private $isTestTransactionCreated = false;

    public function connect($connectionName = null)
    {
        $result = parent::connect($connectionName);

        if ($result && $this->isConnectedToMaster() && !$this->isTestTransactionCreated) {
            $this->setNestTransactionsWithSavepoints(true);
            $this->beginTransaction();
            $this->isTestTransactionCreated = true;
        }

        return $result;
    }

    public function rollbackTestTransactionAndClose()
    {
        if ($this->isTestTransactionCreated) {
            $this->rollback();
            if ($this->isTransactionActive()) {
                throw new Exception("Didn't expect transaction to be active");
            }
        }

        parent::close();
    }

    public function close()
    {
        // no-op
    }
}