Fix tests

Author: Natim

demo/settings.py

@@ -3,7 +3,7 @@
 from __future__ import unicode_literals
 
 DEBUG = True
-
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 ADMINS = (("Some Admin", "some_admin@example.com"),)
 
 MANAGERS = ADMINS

tox.ini

@@ -1,26 +1,43 @@
 [tox]
 envlist =
-    py{37,38,39}-django{22,30,31}
-    py{37,38,39,310}-django{32}
-    py{38,39,310}-django{40}
+    py{38,39,310,311,312}-dj42
+    py{310,311,312}-dj{50,main}
     lint
     docs
 
+[gh-actions]
+python =
+    3.8: py38, lint, sphinx, readme
+    3.9: py39
+    3.10: py310
+    3.11: py311
+    3.12: py312
+
+[gh-actions:env]
+DJANGO =
+    4.2: dj42
+    5.0: dj50
+    main: djmain
+
 [testenv]
 usedevelop = True
 extras = dev
 deps =
-    django22: Django==2.2.*
-    django30: Django==3.0.*
-    django31: Django==3.1.*
-    django32: Django==3.2.*
-    django40: Django==4.0.*
+    dj42: Django>=4.2,<5.0
+    dj50: Django>=5.0,<5.1
+    djmain: https://github.com/django/django/archive/main.tar.gz
 commands =
     pytest {posargs}
+ignore_outcome =
+    djmain: True
 
 [testenv:lint]
+deps =
+    flake8
+    black
+    isort
 commands =
-    isort --check --diff mail_factory demo
+    isort --check --recursive --diff mail_factory demo
     flake8 mail_factory demo --show-source
     black --check mail_factory demo