Run test suite against matrix of relevant OS's and Python versions

.github/workflows/lint-and-test.yml

@@ -1,40 +1,62 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
 
-name: Python package
+name: Lint and Test
 
 on:
   push:
     branches: [ "main" ]
   pull_request:
-    branches: [ "main" ]
+    branches: [ "main", "v*" ]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        include:
+          - python-version: "3.6"
+            os: macos-12
+          - python-version: "3.6"
+            os: windows-latest
+          - python-version: "3.6"
+            os: ubuntu-20.04
+          - python-version: "3.7"
+            os: macos-12
+          - python-version: "3.7"
+            os: windows-latest
+          - python-version: "3.7"
+            os: ubuntu-latest
+
+    runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
-      run: |
-        pytest
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        shell: bash
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8 pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+      - name: Lint with flake8
+        shell: bash
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
+      - name: Test with pytest
+        shell: bash
+        run: |
+          pytest