Add Django 5.1 to the test matrix

pyproject.toml

@@ -22,6 +22,7 @@ classifiers = [
   "Environment :: Web Environment :: Mozilla",
   "Framework :: Django :: 4.2",
   "Framework :: Django :: 5.0",
+  "Framework :: Django :: 5.1",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: BSD License",
   "Operating System :: OS Independent",

tox.ini

@@ -1,15 +1,14 @@
 [tox]
 isolated_build = True
 envlist =
-    {3.10,3.11,3.12,pypy310}-main
-    {3.10,3.11,3.12,pypy310}-5.0.x
-    {3.8,3.9,3.10,3.11,3.12,pypy38,pypy39,pypy310}-4.2.x
+    {3.10,3.11,3.12,pypy310}-dj{4.2,5.0,5.1,main}
+    {3.8,3.9,3.10,3.11,3.12,pypy38,pypy39,pypy310}-dj4.2
     {3.8,3.9,3.10,3.11,3.12,pypy38,pypy39,pypy310}-types
 
 
 # Don't run coverage when testing with pypy:
 # see https://github.com/nedbat/coveragepy/issues/1382
-[testenv:pypy310-main,pypy310-5.0.x,{pypy38,pypy39,pypy310}-4.2.x]
+[testenv:pypy{38,39,310}-dj4.2,pypy310-dj{5.0,5.1,main}]
 commands =
     pip install --upgrade pip
     pip install -e .[tests]
@@ -43,9 +42,10 @@ basepython =
 
 deps =
     pytest
-    4.2.x: Django>=4.2,<4.3
-    5.0.x: Django>=5.0.1,<5.1
-    main: https://github.com/django/django/archive/main.tar.gz
+    dj4.2: Django>=4.2,<4.3
+    dj5.0: Django>=5.0.1,<5.1
+    dj5.1: Django>=5.1,<5.2
+    djmain: https://github.com/django/django/archive/main.tar.gz
 
 
 [gh-actions]