Too many connection during unit testing - symfony

Question

I have a project with a lot of tests class like
class MyTest extends BaseTestCase
{
public function __construct()
{
parent::__construct();
$this->em = $this->get('doctrine')->getManager();
}
public function setUp() {
$this->init();
//load sql data for the tests
$path = $this->get('kernel')->locateResource('#Bundle/Data/Test.sql');
$content_file_sql_data = file_get_contents($path);
$stmt = $this->em->getConnection()->prepare($content_file_sql_data);
$stmt->execute();
$stmt->closeCursor();
}
/*
* Then we do a lot of tests using the database
*/
}
They all extends my BaseTestCase:
abstract class BaseTestCase extends \PHPUnit_Framework_TestCase {
protected $_container;
protected $kernel;
public function __construct() {
parent::__construct();
$this->kernel = new \AppKernel("test", true);
$this->kernel->boot();
$this->_container = $this->kernel->getContainer();
$this->init();
}
//empty the database before each test class
public function init() {
$this->_application = new Application($this->kernel);
$this->_application->setAutoExit(false);
//rebuild and empty the database
$this->runConsole("doctrine:schema:drop", array("--force" => true));
$this->runConsole("doctrine:schema:create");
}
Since I have a lot of tests, i have recently got some errors PDOException: SQLSTATE[08004] [1040] Too many connections. It's like phpunit never close database connection, and around 100 tests I get this error for all the other tests.
How can i fix it?
I tried to put a last test doing $this->em->close() at the end of each test class but it didn't solve it
Some additional information: i'm pretty sure I don't have an issue with ONE test, because if I change the order of the test suite, the error appears around the same amount of tests class passed

Answer 1

My solution was to override shutdown method in my Bundle class:
public function shutdown()
{
if ('test' == $this->container->getParameter('kernel.environment')) {
/* #var EntityManager $em */
$em = $this->container->get('doctrine.orm.default_entity_manager');
$em->getConnection()->close();
}
}