diff --git a/test_app.py b/test_app.py
index 2455414..2543823 100644
--- a/test_app.py
+++ b/test_app.py
@@ -1,23 +1,34 @@
 import flask
+import pytest
 import urllib.request
 
 import app as speedpatrolling
 
 
 def test_ids_fit_in_session():
     base_rev_id = 850000000
     base_page_id = 60000000
     with speedpatrolling.app.test_client() as client:
         with client.session_transaction() as session:
             for rev_id in range(base_rev_id, base_rev_id + 10000):
                 speedpatrolling.ids.append(session, 'skipped_rev_ids', rev_id)
             for page_id in range(base_page_id, base_page_id + 10000):
                 speedpatrolling.ids.append(session, 'acted_page_ids', page_id)
             for page_id in range(base_page_id, base_page_id + 10000):
                 speedpatrolling.ids.append(session, 'skipped_page_ids', page_id)
             for page_id in range(base_page_id, base_page_id + 10000):
                 speedpatrolling.ids.append(session, 'ignored_page_ids', page_id)
         request = urllib.request.Request('http://localhost')
         client.cookie_jar.add_cookie_header(request)
         header = request.get_header('Cookie')
         assert len(header) <= 4093
+
+
+@pytest.mark.parametrize('val, expected', [
+    ('Lucas Werkmeister', False),
+    ('127.0.0.1', True),
+    ('::1', True),
+])
+def test_is_ip_address(val, expected):
+    actual = speedpatrolling.is_ip_address(val)
+    assert expected == actual