ci: add Codecov coverage tracking

Author: statmlben

.github/workflows/ci.yml

@@ -30,7 +30,16 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install package and test dependencies
-        run: pip install ".[test]"
+        run: pip install ".[test]" pytest-cov
 
       - name: Run tests
-        run: pytest -v --tb=short
+        run: pytest -v --tb=short --cov=rehline --cov-report=xml --cov-report=term
+
+      - name: Upload coverage to Codecov
+        if: success()
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-umbrella

README.md

@@ -5,6 +5,7 @@
 [![Documentation](https://img.shields.io/badge/docs-latest-blue.svg)](https://rehline-python.readthedocs.io)
 [![Paper](https://img.shields.io/badge/NeurIPS-2023-red.svg)](https://openreview.net/pdf?id=3pEBW2UPAD)
 [![Downloads](https://pepy.tech/badge/rehline)](https://pepy.tech/project/rehline)
+[![Codecov](https://codecov.io/gh/softmin/ReHLine-python/branch/main/graph/badge.svg)](https://codecov.io/gh/softmin/ReHLine-python)
 
 > **Fast, scalable, and scikit-learn compatible optimization for machine learning**