Convert isolated tests to use Tox

.github/workflows/python-package.yml

@@ -179,34 +179,32 @@ jobs:
         run: python -m sphinx -T -E -W --keep-going . _build/html
 
   isolated: # Test installing the package from source.
-    needs: [ruff, mypy, sdist]
+    needs: [ruff, mypy]
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest"]
     steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: ${{ env.git-depth }}
+      - name: Checkout submodules
+        run: git submodule update --init --recursive --depth 1
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
           python-version: 3.x
       - name: Install Python dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install wheel
+          python -m pip install --upgrade pip tox
       - name: Install APT dependencies
         if: runner.os == 'Linux'
         run: |
           sudo apt-get update
           sudo apt-get install libsdl2-dev
-      - uses: actions/download-artifact@v3
-        with:
-          name: sdist
-      - name: Build package in isolation
-        run: |
-          pip install tcod-*.tar.gz
-      - name: Confirm package import
+      - name: Run tox
         run: |
-          python -c "import tcod.context"
+          tox
 
   linux-wheels:
     needs: [ruff, mypy]

tox.ini

@@ -0,0 +1,17 @@
+[tox]
+isolated_build = True
+env_list =
+    py311
+minversion = 4.4.11
+
+[testenv]
+description = run the tests with pytest
+package = wheel
+wheel_build_env = .pkg
+deps =
+    pytest>=6
+    pytest-cov
+    pytest-benchmark
+    pytest-timeout
+commands =
+    pytest {tty:--color=yes} {posargs}