Upgrade to tox v4

.github/workflows/docs.yml

@@ -26,8 +26,8 @@ jobs:
         with:
           python-version: '3.7'
       - name: Install tox
-        run: pip install --upgrade 'setuptools!=50' tox==3.24.5
+        run: pip install --upgrade 'setuptools!=50' tox==4.4.4
       - name: Setup tox environment
-        run: tox -e ${{ env.TOXENV }} --notest
+        run: tox run -e ${{ env.TOXENV }} --notest
       - name: Test
-        run: tox -e ${{ env.TOXENV }} --skip-pkg-install
+        run: tox run -e ${{ env.TOXENV }} --skip-pkg-install

.github/workflows/test.yml

@@ -127,16 +127,16 @@ jobs:
         ./misc/build-debug-python.sh $PYTHONVERSION $PYTHONDIR $VENV
         source $VENV/bin/activate
     - name: Install tox
-      run: pip install --upgrade 'setuptools!=50' tox==3.24.5
+      run: pip install --upgrade 'setuptools!=50' tox==4.4.4
     - name: Compiled with mypyc
       if: ${{ matrix.test_mypyc }}
       run: |
         pip install -r test-requirements.txt
         CC=clang MYPYC_OPT_LEVEL=0 MYPY_USE_MYPYC=1 pip install -e .
     - name: Setup tox environment
-      run: tox -e ${{ matrix.toxenv }} --notest
+      run: tox run -e ${{ matrix.toxenv }} --notest
     - name: Test
-      run: tox -e ${{ matrix.toxenv }} --skip-pkg-install -- ${{ matrix.tox_extra_args }}
+      run: tox run -e ${{ matrix.toxenv }} --skip-pkg-install -- ${{ matrix.tox_extra_args }}
 
   python-nightly:
     runs-on: ubuntu-latest
@@ -147,11 +147,11 @@ jobs:
         with:
           python-version: '3.12-dev'
       - name: Install tox
-        run: pip install --upgrade 'setuptools!=50' tox==3.24.5
+        run: pip install --upgrade 'setuptools!=50' tox==4.4.4
       - name: Setup tox environment
-        run: tox -e py --notest
+        run: tox run -e py --notest
       - name: Test
-        run: tox -e py --skip-pkg-install -- "-n 2"
+        run: tox run -e py --skip-pkg-install -- "-n 2"
         continue-on-error: true
       - name: Mark as a success
         run: exit 0

CONTRIBUTING.md

@@ -53,13 +53,13 @@ python3 runtests.py
 
 You can also use `tox` to run tests (`tox` handles setting up the test environment for you):
 ```
-tox -e py
+tox run -e py
 
 # Or some specific python version:
-tox -e py39
+tox run -e py39
 
 # Or some specific command:
-tox -e lint
+tox run -e lint
 ```
 
 Some useful commands for running specific tests include:

docs/source/existing_code.rst

@@ -51,7 +51,7 @@ A simple CI script could look something like this:
     python3 -m pip install mypy==0.971
     # Run your standardised mypy invocation, e.g.
     mypy my_project
-    # This could also look like `scripts/run_mypy.sh`, `tox -e mypy`, `make mypy`, etc
+    # This could also look like `scripts/run_mypy.sh`, `tox run -e mypy`, `make mypy`, etc
 
 Ignoring errors from certain modules
 ------------------------------------

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-minversion = 3.8.0
+minversion = 4.4.4
 skip_missing_interpreters = {env:TOX_SKIP_MISSING_INTERPRETERS:True}
 envlist =
     py37,
@@ -30,7 +30,10 @@ commands =
 
 [testenv:type]
 description = type check ourselves
-passenv = TERM MYPY_FORCE_COLOR MYPY_FORCE_TERMINAL_WIDTH
+passenv =
+    TERM
+    MYPY_FORCE_COLOR
+    MYPY_FORCE_TERMINAL_WIDTH
 commands =
     python -m mypy --config-file mypy_self_check.ini -p mypy -p mypyc
     python -m mypy --config-file mypy_self_check.ini misc --exclude misc/fix_annotate.py --exclude misc/async_matrix.py --exclude misc/sync-typeshed.py