Upgrade to tox 4 (#8795)

Author: adamchainz

.github/workflows/main.yml

@@ -34,18 +34,24 @@ jobs:
       run: python -m pip install --upgrade pip setuptools virtualenv wheel
 
     - name: Install dependencies
-      run: python -m pip install --upgrade codecov tox tox-py
+      run: python -m pip install --upgrade codecov tox
+
+    - name: Install tox-py
+      if: ${{ matrix.python-version == '3.6' }}
+      run: python -m pip install --upgrade tox-py
+
+    - name: Run tox targets for ${{ matrix.python-version }}
+      if: ${{ matrix.python-version != '3.6' }}
+      run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d .)
 
     - name: Run tox targets for ${{ matrix.python-version }}
+      if: ${{ matrix.python-version == '3.6' }}
       run: tox --py current
 
     - name: Run extra tox targets
       if: ${{ matrix.python-version == '3.9' }}
       run: |
-        python setup.py bdist_wheel
-        rm -r djangorestframework.egg-info  # see #6139
         tox -e base,dist,docs
-        tox -e dist --installpkg ./dist/djangorestframework-*.whl
 
     - name: Upload coverage
       run: |

tox.ini

@@ -1,20 +1,13 @@
 [tox]
 envlist =
-       {py36,py37,py38,py39}-django30,
-       {py36,py37,py38,py39}-django31,
-       {py36,py37,py38,py39,py310}-django32,
-       {py38,py39,py310}-{django40,django41,djangomain},
-       {py311}-{django41,djangomain},
-       base,dist,docs,
-
-[travis:env]
-DJANGO =
-    3.0: django30
-    3.1: django31
-    3.2: django32
-    4.0: django40
-    4.1: django41
-    main: djangomain
+       {py36,py37,py38,py39}-django30
+       {py36,py37,py38,py39}-django31
+       {py36,py37,py38,py39,py310}-django32
+       {py38,py39,py310}-{django40,django41,djangomain}
+       {py311}-{django41,djangomain}
+       base
+       dist
+       docs
 
 [testenv]
 commands = python -W error::DeprecationWarning -W error::PendingDeprecationWarning runtests.py --coverage {posargs}
@@ -39,7 +32,7 @@ deps =
         -rrequirements/requirements-testing.txt
 
 [testenv:dist]
-commands = ./runtests.py --no-pkgroot --staticfiles {posargs}
+commands = python -W error::DeprecationWarning -W error::PendingDeprecationWarning runtests.py --no-pkgroot --staticfiles {posargs}
 deps =
         django
         -rrequirements/requirements-testing.txt