add laurentb's test case for cookie handling on redirects

tests/test_requests_ext.py

@@ -104,8 +104,27 @@ def test_redirect_encoding(self):
  'php')
  assert r.ok
 
-
-
+ def test_cookies_on_redirects(self):
+ """Test interaction between cookie handling and redirection."""
+ # get a cookie for tinyurl.com ONLY
+ s = requests.session()
+ s.get(url='http://tinyurl.com/preview.php?disable=1')
+ # we should have set a cookie for tinyurl: preview=0
+ self.assertIn('preview', s.cookies)
+ self.assertEqual(s.cookies['preview'], '0')
+ self.assertEqual(list(s.cookies)[0].name, 'preview')
+ self.assertEqual(list(s.cookies)[0].domain, 'tinyurl.com')
+
+ # get cookies on another domain
+ r2 = s.get(url='http://httpbin.org/cookies')
+ # the cookie is not there
+ self.assertNotIn('preview', json.loads(r2.text)['cookies'])
+
+ # this redirects to another domain, httpbin.org
+ # cookies of the first domain should NOT be sent to the next one
+ r3 = s.get(url='http://tinyurl.com/7zp3jnr')
+ assert r3.url == 'http://httpbin.org/cookies'
+ self.assertNotIn('preview', json.loads(r2.text)['cookies'])
 
 if __name__ == '__main__':
  unittest.main()