TST: Pin to tox<4

and add RC testing POC

.github/workflows/ci_workflows.yml

@@ -12,6 +12,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   initial_check:
     name: Mandatory checks before CI
@@ -108,7 +111,9 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
     - name: Install Python dependencies
-      run: python -m pip install --upgrade pip tox
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install "tox<4"
     - name: Run tests
       run: tox -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
     - name: Upload coverage to codecov

.github/workflows/codeql-analysis.yml

@@ -22,6 +22,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze

.github/workflows/open_actions.yml

@@ -8,6 +8,9 @@ on:
     types:
     - opened
 
+permissions:
+  contents: read
+
 jobs:
   triage:
     runs-on: ubuntu-latest

.github/workflows/predeps_workflow.yml

@@ -0,0 +1,54 @@
+name: rc-testing
+
+on:
+  workflow_dispatch:
+  # REMOVE ME
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        include:
+
+          - name: RC test on Linux with remote data
+            os: ubuntu-latest
+            python: '3.11'
+            toxenv: py311-test-predeps
+            toxposargs: --remote-data
+
+          - name: RC test on OSX
+            os: macos-latest
+            python: '3.10'
+            toxenv: py310-test-predeps
+
+          - name: RC test on Windows
+            os: windows-latest
+            python: 3.9
+            toxenv: py39-test-predeps
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Install Python dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install "tox<4"
+    - name: Run tests
+      run: tox -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}

tox.ini

@@ -1,10 +1,14 @@
 [tox]
 envlist =
-    py{38,39,310,311}-test{,-alldeps,-oldestdeps,-devdeps}{,-cov}
+    py{38,39,310,311}-test{,-alldeps,-oldestdeps,-devdeps,-predeps}{,-cov}
     codestyle
     twine
     bandit
     linkcheck
+requires =
+    setuptools >= 30.3.0
+    pip >= 19.3.1
+    tox < 4
 isolated_build = true
 
 [testenv]
@@ -57,6 +61,10 @@ commands =
     cov: pytest --pyargs synphot {toxinidir}/docs --cov synphot --cov-config={toxinidir}/setup.cfg {posargs}
     cov: coverage xml -o {toxinidir}/coverage.xml
 
+pip_pre =
+    predeps: true
+    !predeps: false
+
 [testenv:codestyle]
 skip_install = true
 changedir = {toxinidir}