GitHub Actions: Simplify tests using matrix.os

.github/workflows/tests.yaml

@@ -24,14 +24,22 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  tests-linux:
-    name: run / ${{ matrix.python-version }} / Linux
-    runs-on: ubuntu-latest
+  tests:
+    name: run / ${{ matrix.python-version }} / ${{ matrix.os }}
     timeout-minutes: 25
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        include:
+          - os: macos-latest
+            python-version: "3.9"
+          - os: ubuntu-latest
+            python-version: "pypy-3.9"
+          - os: ubuntu-latest
+            python-version: "pypy-3.10"
+    runs-on: ${{ matrix.os }}
     outputs:
       python-key: ${{ steps.generate-python-key.outputs.key }}
     steps:
@@ -76,6 +84,7 @@ jobs:
           pip list | grep 'astroid\|pylint'
           python -m pytest -vv --minimal-messages-config tests/test_functional.py
       - name: Upload coverage artifact
+        if: runner.os == 'Linux'
         uses: actions/[email protected]
         with:
           name: coverage-${{ matrix.python-version }}
@@ -86,11 +95,11 @@ jobs:
     name: process / coverage
     runs-on: ubuntu-latest
     timeout-minutes: 5
-    needs: tests-linux
+    needs: tests
     steps:
       - name: Check out code from GitHub
         uses: actions/[email protected]
-      - name: Set up Python 3.12
+      - name: Set up Python 3.13
         id: python
         uses: actions/[email protected]
         with:
@@ -122,7 +131,7 @@ jobs:
     name: run benchmark / ${{ matrix.python-version }} / Linux
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    needs: tests-linux
+    needs: tests
     strategy:
       fail-fast: false
       matrix:
@@ -173,7 +182,7 @@ jobs:
     name: run / ${{ matrix.python-version }} / Windows
     runs-on: windows-latest
     timeout-minutes: 25
-    needs: tests-linux
+    needs: tests
     strategy:
       fail-fast: false
       matrix:
@@ -217,93 +226,3 @@ jobs:
           . venv\\Scripts\\activate
           pip list | grep 'astroid\|pylint'
           python -m pytest --durations=10 --benchmark-disable tests/
-
-  tests-macos:
-    name: run / ${{ matrix.python-version }} / macOS
-    runs-on: macos-latest
-    timeout-minutes: 25
-    needs: tests-linux
-    strategy:
-      fail-fast: false
-      matrix:
-        # We only run on the oldest supported version on Mac
-        python-version: ["3.9"]
-    steps:
-      - name: Check out code from GitHub
-        uses: actions/[email protected]
-      - name: Set up Python ${{ matrix.python-version }}
-        id: python
-        uses: actions/[email protected]
-        with:
-          python-version: ${{ matrix.python-version }}
-          check-latest: true
-      - name: Generate partial Python venv restore key
-        id: generate-python-key
-        run: >-
-          echo "key=venv-${{ env.CACHE_VERSION }}-${{
-            hashFiles('pyproject.toml', 'requirements_test_min.txt')
-          }}" >> $GITHUB_OUTPUT
-      - name: Restore Python virtual environment
-        id: cache-venv
-        uses: actions/[email protected]
-        with:
-          path: venv
-          key: >-
-            ${{ runner.os }}-${{ steps.python.outputs.python-version }}-${{
-            steps.generate-python-key.outputs.key }}
-      - name: Create Python virtual environment
-        if: steps.cache-venv.outputs.cache-hit != 'true'
-        run: |
-          python -m venv venv
-          . venv/bin/activate
-          python -m pip install --upgrade pip setuptools wheel
-          pip install --upgrade --requirement requirements_test_min.txt
-      - name: Run pytest
-        run: |
-          . venv/bin/activate
-          pip list | grep 'astroid\|pylint'
-          python -m pytest --durations=10 --benchmark-disable tests/
-
-  tests-pypy:
-    name: run / ${{ matrix.python-version }} / Linux
-    runs-on: ubuntu-latest
-    timeout-minutes: 25
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["pypy-3.9", "pypy-3.10"]
-    steps:
-      - name: Check out code from GitHub
-        uses: actions/[email protected]
-      - name: Set up Python ${{ matrix.python-version }}
-        id: python
-        uses: actions/[email protected]
-        with:
-          python-version: ${{ matrix.python-version }}
-          check-latest: true
-      - name: Generate partial Python venv restore key
-        id: generate-python-key
-        run: >-
-          echo "key=venv-${{ env.CACHE_VERSION }}-${{
-            hashFiles('pyproject.toml', 'requirements_test_min.txt')
-          }}" >> $GITHUB_OUTPUT
-      - name: Restore Python virtual environment
-        id: cache-venv
-        uses: actions/[email protected]
-        with:
-          path: venv
-          key: >-
-            ${{ runner.os }}-${{ matrix.python-version }}-${{
-            steps.generate-python-key.outputs.key }}
-      - name: Create Python virtual environment
-        if: steps.cache-venv.outputs.cache-hit != 'true'
-        run: |
-          python -m venv venv
-          . venv/bin/activate
-          python -m pip install --upgrade pip setuptools wheel
-          pip install --upgrade --requirement requirements_test_min.txt
-      - name: Run pytest
-        run: |
-          . venv/bin/activate
-          pip list | grep 'astroid\|pylint'
-          python -m pytest --durations=10 --benchmark-disable tests/