Make tests more robust, use django-pytest

tests/test_middleware_integration.py

@@ -1,15 +1,10 @@
 import json
-import os
 from datetime import datetime
 from zoneinfo import ZoneInfo
 
-import django
 from django.conf import settings
 from django.test import TestCase, Client
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "timetracker.settings")
-django.setup()
-
 from games.models import Device, Game, Platform, Purchase, Session
 from django.contrib.auth.models import User