fix Django 3.2

tests/test_auth.py

@@ -1,5 +1,7 @@
 import urllib.parse
+from unittest import skipIf
 
+import django
 import post_office.models
 from django.contrib.auth import get_user_model
 from django.test import RequestFactory, TestCase, override_settings
@@ -70,6 +72,11 @@ def test_register_inactive_user(self):
         )
         self.assertContains(resp, 'An e-mail has been sent to your address.')
 
+    # TODO: remove skip when 3.2 no longer supported
+    @skipIf(
+        django.VERSION < (4, 1),
+        'assertFormError requires response object until Django 4.1',
+    )
     def test_register_active_user(self):
         AuthUser.objects.create(
             username='existinguser', email='test@email.com', is_active=True
@@ -78,8 +85,9 @@ def test_register_active_user(self):
             reverse('tracker:register'), data={'email': 'test@email.com'}
         )
         self.assertFormError(
-            resp,
-            'form',
+            resp.context['form'],
             'email',
-            'This email is already registered. Please log in, (or reset your password if you forgot it).',
+            [
+                'This email is already registered. Please log in, (or reset your password if you forgot it).'
+            ],
         )

tests/test_prize.py

@@ -1,8 +1,10 @@
 import datetime
 import random
 from decimal import Decimal
+from unittest import skipIf
 from unittest.mock import patch
 
+import django
 import post_office.models
 import pytz
 from dateutil.parser import parse as parse_date
@@ -1467,6 +1469,11 @@ def test_prize_key_import_action(self):
             reverse('admin:tracker_prize_key_import', args=(self.prize_with_keys.id,)),
         )
 
+    # TODO: remove skip when 3.2 no longer supported
+    @skipIf(
+        django.VERSION < (4, 1),
+        'assertFormError requires response object until Django 4.1',
+    )
     def test_prize_key_import_form(self):
         keys = ['dead-beef-dead-beef-123%d' % i for i in range(5)]
         response = self.client.get(
@@ -1521,7 +1528,7 @@ def test_prize_key_import_form(self):
             {'keys': keys[0]},
         )
         self.assertFormError(
-            response, 'form', 'keys', ['At least one key already exists.']
+            response.context['form'], 'keys', ['At least one key already exists.']
         )
 
     def test_prize_winner_admin(self):

tests/test_speedrun.py

@@ -1,6 +1,8 @@
 import datetime
 import random
+from unittest import skipIf
 
+import django
 import pytz
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
@@ -313,6 +315,10 @@ def test_start_run(self):
         self.assertEqual(self.run1.run_time, '0:41:20')
         self.assertEqual(self.run1.setup_time, '0:09:40')
 
+    @skipIf(
+        django.VERSION < (4, 1),
+        'assertFormError requires response object until Django 4.1',
+    )
     def test_invalid_time(self):
         from tracker.admin.forms import StartRunForm
 
@@ -329,6 +335,10 @@ def test_invalid_time(self):
         self.assertFalse(form.is_valid())
         self.assertFormError(form, None, StartRunForm.Errors.invalid_start_time)
 
+    @skipIf(
+        django.VERSION < (4, 1),
+        'assertFormError requires response object until Django 4.1',
+    )
     def test_anchor_drift(self):
         from tracker.admin.forms import StartRunForm
 

tracker/models/event.py

@@ -21,6 +21,19 @@
 from .fields import TimestampField
 from .util import LatestEvent
 
+# TODO: remove when 3.10 is oldest supported version
+
+try:
+    from itertools import pairwise
+except ImportError:
+
+    def pairwise(iterable):
+        # pairwise('ABCDEFG') --> AB BC CD DE EF FG
+        a, b = itertools.tee(iterable)
+        next(b, None)
+        return zip(a, b)
+
+
 __all__ = [
     'Event',
     'PostbackURL',
@@ -547,7 +560,7 @@ def clean(self):
                             'order': 'Next anchor in the order would occur before this one'
                         }
                     )
-                for c, n in itertools.pairwise(
+                for c, n in pairwise(
                     itertools.chain(
                         [self],
                         SpeedRun.objects.filter(