Update GitHub Actions workflows

.github/workflows/coverage.yml

@@ -5,6 +5,9 @@ on: [push]
 permissions:
   contents: read
 
+env:
+  FORCE_COLOR: "1"
+
 jobs:
   coverage:
     runs-on: ubuntu-latest
@@ -24,11 +27,16 @@ jobs:
       run: sudo apt-get install graphviz
 
     - name: Install dependencies
-      run: python -m pip install -U pip tox pytest-cov
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install .[test] pytest-cov
 
-    - name: Run Tox
-      run: tox -e py -- -vv
+    - name: Test with pytest
+      run: python -m pytest -vv
       env:
+        PYTHONDEVMODE: "1"  # -X dev
+        PYTHONWARNDEFAULTENCODING: "1"  # -X warn_default_encoding
+        PYTHONWARNINGS: "always"  #  -W always
         PYTEST_ADDOPTS: "--cov ./ --cov-append --cov-config pyproject.toml"
         VIRTUALENV_SYSTEM_SITE_PACKAGES: "1"