sessionReset example

$session_handler = $this->container->get('session_handler.write_safe');
    $this->assertTrue($session_handler->isSessionWritable(), 'session_handler->isSessionWritable() initially returns TRUE.');
    $session_handler->setSessionWritable(FALSE);
    $this->assertFalse($session_handler->isSessionWritable(), '$session_handler->isSessionWritable() returns FALSE after disabling.');
    $session_handler->setSessionWritable(TRUE);
    $this->assertTrue($session_handler->isSessionWritable(), '$session_handler->isSessionWritable() returns TRUE after enabling.');

    // Test session hardening code from SA-2008-044.     $user = $this->drupalCreateUser();

    // Enable sessions.     $this->sessionReset();

    // Make sure the session cookie is set as HttpOnly. We can only test this in     // the header, with the test setup     // \GuzzleHttp\Cookie\SetCookie::getHttpOnly() always returns FALSE.     // Start a new session by setting a message.     $this->drupalGet('session-test/set-message');
    $this->assertSessionCookie(TRUE);
    // Verify that the session cookie is set as HttpOnly.     $this->assertSession()->responseHeaderMatches('Set-Cookie', '/HttpOnly/i');

    // Verify that the session is regenerated if a module calls exit