Add tox config. In GitHub workflows, use tox.

Ref#12

Author: jaraco

.github/workflows/main.yml

@@ -20,21 +20,13 @@ jobs:
         python-version: [3.8, 3.9, "3.10", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install .
-        python -m pip install -r dev-requirements.txt
-        pip install pytest-cov
-
-    - name: Lint with pyflakes
-      run: |
-        doit pyflakes
-    - name: Test & cover with pytest
-      run: |
-        pytest
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+          allow-prereleases: true
+      - name: Install tox
+        run: python -m pip install tox
+      - name: Run
+        run: tox

tox.ini

@@ -0,0 +1,9 @@
+[testenv]
+description = perform primary checks (tests, style, types, coverage)
+deps =
+setenv =
+	PYTHONWARNDEFAULTENCODING = 1
+commands =
+	pytest {posargs}
+usedevelop = True
+extras =