symfony functional test clear session and cookies

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class YourTest extends WebTestCase
{
    public function testSomething()
    {
        $client = static::createClient();

        $client->request('GET', '/your/route');

        // Clear the session and cookies
        $client->getContainer()->get('session')->clear();
        $client->getCookieJar()->clear();

        // Add your assertions here
        $this->assertResponseIsSuccessful();
    }
}