ci: enable code coverage reporting on GitHub

- Upgrade codecov-action to v5 with token support
- Add coverage config to pyproject.toml (fail_under=85%)
- Add term-missing to coverage report output
- Upload coverage from Python 3.12 matrix
- Add Tests and Codecov badges to README

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: thinkall

.github/workflows/tests.yml

@@ -27,13 +27,16 @@ jobs:
           python -m pip install --upgrade pip
           pip install -e ".[dev]"
 
-      - name: Run tests
+      - name: Run tests with coverage
         run: |
-          pytest tests/ -v --cov=featcopilot --cov-report=xml
+          pytest tests/ -v --cov=featcopilot --cov-report=xml --cov-report=term-missing
 
-      - name: Upload coverage
-        uses: codecov/codecov-action@v4
-        if: matrix.python-version == '3.11'
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        if: matrix.python-version == '3.12'
         with:
           files: ./coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
+          flags: unittests
+          name: featcopilot-py${{ matrix.python-version }}

README.md

@@ -2,6 +2,9 @@
 
 **Next-Generation LLM-Powered Auto Feature Engineering Framework**
 
+[![Tests](https://github.com/thinkall/featcopilot/actions/workflows/tests.yml/badge.svg)](https://github.com/thinkall/featcopilot/actions/workflows/tests.yml)
+[![codecov](https://codecov.io/gh/thinkall/featcopilot/graph/badge.svg)](https://codecov.io/gh/thinkall/featcopilot)
+
 FeatCopilot automatically generates, selects, and explains predictive features using semantic understanding. It analyzes column meanings, applies domain-aware transformations, and provides human-readable explanations—turning raw data into ML-ready features in seconds.
 
 ## 🎬 Introduction Video

pyproject.toml

@@ -111,3 +111,17 @@ ignore_missing_imports = true
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 asyncio_mode = "auto"
+
+[tool.coverage.run]
+source = ["featcopilot"]
+omit = ["featcopilot/__pycache__/*"]
+
+[tool.coverage.report]
+show_missing = true
+fail_under = 85
+exclude_lines = [
+    "pragma: no cover",
+    "if __name__ == .__main__.",
+    "pass",
+    "raise NotImplementedError",
+]