chore: update CI workflows for improved packaging and testing

.github/workflows/ci.yml

@@ -0,0 +1,74 @@
+name: Lint and Test
+
+on:
+  pull_request:
+    paths:
+      - .github/workflows/ci.yml
+      - pyproject.toml
+      - src/**
+      - tests/**
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+
+      - name: Install dev dependencies
+        run: uv sync --group dev
+
+      - name: Run pre-commit hooks
+        run: uv run pre-commit run --all-files
+
+  get-python-versions:
+    name: Get Python versions
+    runs-on: ubuntu-latest
+    outputs:
+      python-versions: ${{ steps.versions.outputs.python-versions }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v6
+
+      - name: Discover available Python versions
+        id: versions
+        run: |
+          min_ver=$(python3 -c "import tomllib; print(tomllib.load(open('pyproject.toml', 'rb'))['project']['requires-python'])")
+          versions=$(
+            uv python list --all-versions "$min_ver" \
+              | grep -oP 'cpython-\K\d+\.\d+(?=\.\d+-)'  \
+              | sort -uV \
+              | python3 -c "import sys, json; print(json.dumps(sys.stdin.read().split()))"
+          )
+          echo "python-versions=$versions" >> $GITHUB_OUTPUT
+
+  test:
+    name: Test (Python ${{ matrix.python-version }})
+    needs: get-python-versions
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ${{ fromJson(needs.get-python-versions.outputs.python-versions) }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dev dependencies
+        run: uv sync --group dev --extra all
+
+      - name: Run tests
+        run: uv run pytest

.github/workflows/pack-pip.yml

@@ -1,5 +1,6 @@
 name: pip packaging
-on: 
+
+on:
   workflow_dispatch:
     inputs:
       python_repository:
@@ -14,7 +15,11 @@ on:
       - .github/workflows/pack-pip.yml
       - pyproject.toml
       - CMakeLists.txt
-
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 defaults:
   run:
     shell: bash
@@ -39,15 +44,21 @@ jobs:
       - name: Build wheels
         uses: pypa/cibuildwheel@v3.3.1
 
-      - name: install Python
+      - name: Set up Python
         uses: actions/setup-python@v5
-
+
+      - name: Set up UV
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+
       - name: Test built wheel
         run: |
-          pip install --find-links=wheelhouse khisto
-          pip install pytest>=8.3 pytest-cov>=6 pytest-xdist>=3.6 pytest-sugar>=1.0
-          pytest tests/
-
+          uv venv .test-env
+          uv pip install --python .test-env --find-links=wheelhouse "khisto[all]"
+          VIRTUAL_ENV=.test-env uv sync --group dev --no-install-project
+          VIRTUAL_ENV=.test-env uv run pytest tests/ --no-cov
+
       - uses: actions/upload-artifact@v6
         with:
           name: pkg-wheel-${{ matrix.os }}
@@ -65,7 +76,7 @@ jobs:
     environment:
       name: testpypi
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           pattern: pkg-*
           path: dist
@@ -74,9 +85,9 @@ jobs:
         with:
           verbose: true
           repository-url: https://test.pypi.org/legacy/
-  
+
   release-pypi:
-     # Publish only on tag pushes in the KhiopsML repository
+    # Publish only on tag pushes in the KhiopsML repository
     name: Publish to PyPI.org
     if: github.ref_type == 'tag' && github.repository_owner == 'KhiopsML' && inputs.python_repository == 'pypi'
     needs: [build-wheel]
@@ -86,7 +97,7 @@ jobs:
     environment:
       name: pypi
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           pattern: pkg-*
           path: dist

tests/conftest.py

@@ -0,0 +1,9 @@
+# Copyright (c) 2025-2026 Orange. All rights reserved.
+# This software is distributed under the BSD 3-Clause-clear License, the text of which is available
+# at https://spdx.org/licenses/BSD-3-Clause-Clear.html or see the "LICENSE" file for more details.
+
+"""Root conftest: force a non-interactive matplotlib backend for all tests."""
+
+import os
+
+os.environ.setdefault("MPLBACKEND", "Agg")