```
import unittest
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

class PythonOrgSearch(unittest.TestCase):

    def setUp(self):
        self.driver = webdriver.Firefox()

    def test_search_in_python_org(self):
        driver = self.driver
        driver.get("http://www.python.org")
        self.assertIn("Python", driver.title)
        elem = driver.find_element_by_name("q")
        elem.send_keys("selenium")
        elem.send_keys(Keys.RETURN)
        self.assertIn("Google", driver.title)

    def tearDown(self):
        self.driver.close()

if __name__=="__main__":
    unittest.main()

```

I am getting this warning. What is wrong?

```
Warning (from warnings module):
  File "C:\Python33\lib\site-packages\selenium-2.37.2-py3.3.egg\selenium\webdriver\firefox\firefox_binary.py", line 95
    while not utils.is_connectable(self.profile.port):
ResourceWarning: unclosed <socket.socket object, fd=400, family=2, type=1, proto=0>

```