update singleuser auth test url check

handle `?redirects`

jupyterhub/tests/test_singleuser.py

@@ -2,6 +2,7 @@
 
 from subprocess import check_output
 import sys
+from urllib.parse import urlparse
 
 import pytest
 
@@ -33,7 +34,7 @@ def test_singleuser_auth(app):
     # with cookies, login successful
     r = yield async_requests.get(url, cookies=cookies)
     r.raise_for_status()
-    assert r.url.rstrip('/').endswith('/user/nandy/tree')
+    assert urlparse(r.url).path.rstrip('/').endswith('/user/nandy/tree')
     assert r.status_code == 200
 
     # logout