TST: Pin tox<4

Co-authored-by: Stuart Mumford <stuart@cadair.com>

.circleci/config.yml

@@ -22,7 +22,7 @@ jobs:
           command: |
               sudo apt update
               sudo apt install texlive texlive-latex-extra texlive-fonts-recommended dvipng cm-super
-              pip install pip tox --upgrade
+              pip install pip "tox<4"
       - run:
           name: Run tests
           command: tox -v

.github/workflows/ci_cron_daily.yml

@@ -38,6 +38,7 @@ jobs:
     with:
       submodules: false
       coverage: codecov
+      toxdeps: "'tox<4'"
       libraries: |
         apt:
           - language-pack-de

.github/workflows/ci_cron_weekly.yml

@@ -83,7 +83,7 @@ jobs:
       if: ${{ matrix.toxenv == 'linkcheck' }}
       run: sudo apt-get install graphviz
     - name: Install Python dependencies
-      run: python -m pip install --upgrade tox
+      run: python -m pip install --upgrade "tox<4"
     - name: Run tests
       run: tox ${{ matrix.toxargs}} -e ${{ matrix.toxenv}} -- ${{ matrix.toxposargs}}
 

.github/workflows/ci_workflows.yml

@@ -50,6 +50,7 @@ jobs:
     with:
       submodules: false
       coverage: codecov
+      toxdeps: "'tox<4'"
       libraries: |
         apt:
           - language-pack-fr
@@ -86,6 +87,7 @@ jobs:
     with:
       submodules: false
       coverage: codecov
+      toxdeps: "'tox<4'"
       libraries: |
         apt:
           - language-pack-de
@@ -116,7 +118,7 @@ jobs:
     # test the ability to run the test suite in parallel.
     # Numpy is pinned to avoid building it from source for numpy 1.21.5
     - name: Install dependencies for Python 3.8
-      run: /opt/python/cp38-cp38/bin/pip install tox
+      run: /opt/python/cp38-cp38/bin/pip install "tox<4"
     - name: Run tests for Python 3.8
       run: /opt/python/cp38-cp38/bin/python -m tox -e py38-numpy120-test -- -n=4 --durations=50
     # We use the 3.8 build to check that running tests twice in a row in the

.github/workflows/publish.yml

@@ -20,6 +20,7 @@ jobs:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@v1
     if: (github.event_name == 'push' || github.event_name == 'pull_request')
     with:
+      toxdeps: "'tox<4'"
       upload_to_pypi: false
       upload_to_anaconda: false
       test_extras: test
@@ -35,6 +36,7 @@ jobs:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish.yml@v1
     if: (github.repository == 'astropy/astropy' && ( startsWith(github.ref, 'refs/tags/v') || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || contains(github.event.pull_request.labels.*.name, 'Build all wheels')))
     with:
+      toxdeps: "'tox<4'"
 
       # We upload to PyPI for all tags starting with v but not ones ending in .dev
       upload_to_pypi: ${{ startsWith(github.ref, 'refs/tags/v') && !endsWith(github.ref, '.dev') && (github.event_name == 'push' || github.event_name == 'workflow_dispatch') }}

tox.ini

@@ -8,6 +8,7 @@ requires =
     setuptools >= 30.3.0
     pip >= 19.3.1
     tox-pypi-filter >= 0.12
+    tox < 4
 isolated_build = true
 
 [testenv]