Fine-grained test matrix. (jazzband#742)

* Fine-grained test matrix.

* Remove max parallel.

.github/workflows/test.yml

@@ -4,12 +4,13 @@ on: [push, pull_request]
 
 jobs:
   build:
+    name: build (Python ${{ matrix.python-version }}, Django ${{ matrix.django-version }})
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
-      max-parallel: 5
       matrix:
         python-version: ['3.6', '3.7', '3.8', '3.9', 'pypy3']
+        django-version: ['2.2', '3.0', '3.1', 'dev']
 
     steps:
     - uses: actions/checkout@v2
@@ -49,6 +50,8 @@ jobs:
     - name: Tox tests
       run: |
         tox -v
+      env:
+        DJANGO: ${{ matrix.django-version }}
 
     - name: Upload coverage
       uses: codecov/codecov-action@v1

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
   pypy3-dj{22,30,31}
-  py{36,37,38,39}-dj{22,30,31,master}
+  py{36,37,38,39}-dj{22,30,31,dev}
   docs
 
 [gh-actions]
@@ -12,6 +12,13 @@ python =
     3.9: py39
     pypy3: pypy3
 
+[gh-actions:env]
+DJANGO =
+    2.2: dj22
+    3.0: dj30
+    3.1: dj31
+    dev: djdev
+
 [testenv]
 basepython =
   pypy3: pypy3
@@ -24,7 +31,7 @@ deps =
   dj22: Django>=2.2.1,<2.3
   dj30: Django>=3.0,<3.1
   dj31: Django>=3.1,<3.2
-  djmaster: https://github.com/django/django/archive/master.tar.gz
+  djdev: https://github.com/django/django/archive/master.tar.gz
   jinja2
   coverage
   jsmin==2.2.0
@@ -40,9 +47,10 @@ commands =
     {envbindir}/coverage report
     {envbindir}/coverage xml
 whitelist_externals = npm
-
-[testenv:py{36,37,38,39}-djmaster]
-ignore_errors = True
+ignore_outcome =
+    djdev: True
+ignore_errors =
+    djdev: True
 
 [testenv:docs]
 basepython = python3.8