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diff --git a/vendor/symfony/http-kernel/EventListener/AbstractTestSessionListener.php b/vendor/symfony/http-kernel/EventListener/AbstractTestSessionListener.php
new file mode 100644
index 000000000..82061fd6e
--- /dev/null
+++ b/vendor/symfony/http-kernel/EventListener/AbstractTestSessionListener.php
@@ -0,0 +1,93 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\EventListener;
+
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * TestSessionListener.
+ *
+ * Saves session in test environment.
+ *
+ * @author Bulat Shakirzyanov <mallluhuct@gmail.com>
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class AbstractTestSessionListener implements EventSubscriberInterface
+{
+    private $sessionId;
+
+    public function onKernelRequest(GetResponseEvent $event)
+    {
+        if (!$event->isMasterRequest()) {
+            return;
+        }
+
+        // bootstrap the session
+        $session = $this->getSession();
+        if (!$session) {
+            return;
+        }
+
+        $cookies = $event->getRequest()->cookies;
+
+        if ($cookies->has($session->getName())) {
+            $this->sessionId = $cookies->get($session->getName());
+            $session->setId($this->sessionId);
+        }
+    }
+
+    /**
+     * Checks if session was initialized and saves if current request is master
+     * Runs on 'kernel.response' in test environment.
+     */
+    public function onKernelResponse(FilterResponseEvent $event)
+    {
+        if (!$event->isMasterRequest()) {
+            return;
+        }
+
+        if (!$session = $event->getRequest()->getSession()) {
+            return;
+        }
+
+        if ($wasStarted = $session->isStarted()) {
+            $session->save();
+        }
+
+        if ($session instanceof Session ? !$session->isEmpty() || (null !== $this->sessionId && $session->getId() !== $this->sessionId) : $wasStarted) {
+            $params = session_get_cookie_params();
+            $event->getResponse()->headers->setCookie(new Cookie($session->getName(), $session->getId(), 0 === $params['lifetime'] ? 0 : time() + $params['lifetime'], $params['path'], $params['domain'], $params['secure'], $params['httponly']));
+            $this->sessionId = $session->getId();
+        }
+    }
+
+    public static function getSubscribedEvents()
+    {
+        return array(
+            KernelEvents::REQUEST => array('onKernelRequest', 192),
+            KernelEvents::RESPONSE => array('onKernelResponse', -128),
+        );
+    }
+
+    /**
+     * Gets the session object.
+     *
+     * @return SessionInterface|null A SessionInterface instance or null if no session is available
+     */
+    abstract protected function getSession();
+}