conf: Rework code coverage config.

.github/workflows/python-package.yml

@@ -52,6 +52,12 @@ jobs:
         run: python -m pip install --upgrade codecov tox
       - name: Run tox targets for ${{ matrix.python-version }}
         run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d . | cut -f 1 -d '-')
-      - name: Upload coverage
-        run: |
-          codecov -e TOXENV,DJANGO
+      -   name: Upload coverage reports to Codecov
+          uses: codecov/codecov-action@v3
+          with:
+            token: ${{ secrets.CODECOV_TOKEN }}
+            files: coverage.xml
+            flags: unittests
+            env_vars: TOXENV, PYTHON, DJANGO
+            fail_ci_if_error: true
+            verbose: true

tox.ini

@@ -10,10 +10,11 @@ setenv =
     PYTHONPATH = {toxinidir}
 deps =
     pytest
+    pytest-cov
     pytest-django
     django42: django>=4.2,<5.0
     django50: django>=5.0,<5.1
     django51: django>=5.1,<5.2
     djangomain: https://github.com/django/django/archive/main.tar.gz
 commands =
-    pytest
+    pytest --cov=./ --cov-report=xml