Update project test suite and metadata for Django 4.0 support

Author: thibaudcolas

.github/workflows/ci.yml

@@ -16,21 +16,24 @@ jobs:
         with:
           poetry-version: '1.1.10'
       - run: pip install tox
-      - run: tox -e lint,py310-dj32
+      - run: tox -e lint,py310-dj40
   test_compatibility:
     needs: test
     runs-on: ubuntu-latest
     strategy:
       matrix:
         include:
+          # Test with all supported Django versions, for all supported Python versions.
+          # Additionally test on Django’s main branch with the most recent Python version.
           - python: "3.7"
+            # Skip Django 4.0, which doesn’t support Python 3.7.
             toxenv: py37-dj22,py37-dj30,py37-dj31,py37-dj32
           - python: "3.8"
-            toxenv: py38-dj22,py38-dj30,py38-dj31,py38-dj32
+            toxenv: py38-dj22,py38-dj30,py38-dj31,py38-dj32,py38-dj40
           - python: "3.9"
-            toxenv: py39-dj22,py39-dj30,py39-dj31,py39-dj32,py39-djmain
+            toxenv: py39-dj22,py39-dj30,py39-dj31,py39-dj32,py39-dj40
           - python: "3.10"
-            toxenv: py310-dj22,py310-dj30,py310-dj31,py310-dj32,py310-djmain
+            toxenv: py310-dj22,py310-dj30,py310-dj31,py310-dj32,py310-dj40,py310-djmain
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2

pyproject.toml

@@ -25,6 +25,7 @@ classifiers = [
     "Framework :: Django :: 3.0",
     "Framework :: Django :: 3.1",
     "Framework :: Django :: 3.2",
+    "Framework :: Django :: 4.0",
 ]
 packages = [
     { include = "pattern_library" },
@@ -38,7 +39,7 @@ exclude = [
 
 [tool.poetry.dependencies]
 python = "^3.7"
-Django = ">=2.2,<4.0"
+Django = ">=2.2,<4.1"
 PyYAML = ">=5.1,<7.0"
 Markdown = "^3.1"
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{37,38,39,310}-dj{22,30,31,32,main}, lint
+envlist = py{37,38,39,310}-dj{22,30,31,32,40,main}, lint
 skipsdist = true
 
 [testenv]
@@ -15,6 +15,7 @@ deps =
     dj30: Django>=3.0,<3.1
     dj31: Django>=3.1,<3.2
     dj32: Django>=3.2,<3.3
+    dj40: Django>=4.0,<4.1
     djmain: https://github.com/django/django/archive/main.zip
 
 [testenv:lint]