ci: upload test coverage to Codecov (#352)

Author: jooola

.github/workflows/test.yml

@@ -26,4 +26,7 @@ jobs:
         run: pip install tox tox-gh-actions
 
       - name: Run tox
-        run: tox
+        run: tox -- --cov --cov-report=xml
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3

setup.py

@@ -54,6 +54,7 @@
             "coverage>=7.4,<7.5",
             "pylint>=3,<3.1",
             "pytest>=7.4,<7.5",
+            "pytest-cov>=4.1.0,<4.2",
             "mypy>=1.8,<1.9",
             "types-python-dateutil",
             "types-requests",