WIP

.github/workflows/ci.yml

@@ -1,7 +1,7 @@
 name: CI
 on:
   push:
-    branches: [main]
+    branches: [tox4]
   pull_request:
 
 env:
@@ -16,8 +16,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-latest, macos-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        os: [ubuntu-20.04]
+        python-version: ["3.7", "3.8"]
+        tox-version: ["latest", "<4"]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
@@ -35,7 +36,33 @@ jobs:
         run: |
           python -m pip install --disable-pip-version-check .
       - name: Run tests on ${{ matrix.os }}
-        run: nox --non-interactive --error-on-missing-interpreter --session "tests-${{ matrix.python-version }}" -- --full-trace
+        run: nox --non-interactive --error-on-missing-interpreter --session "tests(python='${{ matrix.python-version }}', tox_version='${{ matrix.tox-version }}')" -- --full-trace
+      - name: Save coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage
+          path: .coverage.*
+
+  coverage:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - name: Install Nox-under-test
+        run: |
+          python -m pip install --disable-pip-version-check .
+      - name: Download individual coverage reports
+        uses: actions/download-artifact@v3
+        with:
+          name: coverage
+      - name: Display structure of downloaded files
+        run: ls -R
+      - name: Run coverage
+        run: nox --non-interactive --session "cover"
 
   lint:
     runs-on: ubuntu-latest

noxfile.py

@@ -38,11 +38,17 @@
         (python, tox_version)
         for python in ("3.7", "3.8", "3.9", "3.10", "3.11")
         for tox_version in ("latest", "<4")
-        if (python, tox_version) != ("3.7", "latest")
     ],
 )
 def tests(session: nox.Session, tox_version: str) -> None:
     """Run test suite with pytest."""
+    # Because there is a dependency conflict between
+    # argcomplete and the latest tox (both depend on
+    # a different version of importlibmetadata for Py 3.7)
+    # pip installs tox 3 as the latest one for Py 3.7.
+    if session.python == "3.7" and tox_version == "latest":
+        return
+
     session.create_tmp()  # Fixes permission errors on Windows
     session.install("-r", "requirements-test.txt")
     session.install("-e", ".[tox_to_nox]")
@@ -55,7 +61,7 @@ def tests(session: nox.Session, tox_version: str) -> None:
         "pyproject.toml",
         "--cov-report=",
         *session.posargs,
-        env={"COVERAGE_FILE": f".coverage.{session.python}.{tox_version}"},
+        env={"COVERAGE_FILE": f".coverage.{session.python}.tox.{tox_version.lstrip('<')}"},
     )