Updated test yaml configuration to add Codecov coverage

.github/workflows/python-app.yml

@@ -36,7 +36,7 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pytest
+        pytest --cov .
     - name: Upload coverage reports to Codecov
       uses: codecov/[email protected]
       with: