From 0cc0db40baa2e714db2062b4eac4cbc8b5943992 Mon Sep 17 00:00:00 2001
From: Frej Drejhammar <frej.drejhammar@gmail.com>
Date: Tue, 26 Dec 2023 15:59:44 +0100
Subject: [PATCH] Run tests with multiple Python versions

Run the CI tests with both the earliest supported Python version and
the latest stable release.

The intent is to quickly notice when new features require adjusting
the oldest supported Python version and also detect when the latest
stable version breaks old code (as when 3.12 removed `imp` and we
switched to `importlib` in #311).
---
 .github/workflows/ci.yml | 57 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57efee7..2f5954f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,8 +8,58 @@ on:
     branches: [master]
 
 jobs:
-  test:
-    name: Run test suite
+  test-earliest:
+    name: Run test suite on the earliest supported Python version
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v4
+        name: Checkout repository
+        with:
+          fetch-depth: 1
+          submodules: 'recursive'
+      - uses: actions/setup-python@v5
+        id: earliest
+        with:
+          python-version: '3.5.x'
+          check-latest: true
+
+      - name: Report selected version
+        run: echo '${{ steps.earliest.outputs.python-version }}'
+
+      - name: Look for hg
+        run: hg --version
+
+      - name: Run tests on earliest supported Python version
+        run: make -C t
+
+  test-latest:
+    name: Run test suite on the latest supported python version
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        name: Checkout repository
+        with:
+          fetch-depth: 1
+          submodules: 'recursive'
+      - uses: actions/setup-python@v5
+        id: latest
+        with:
+          python-version: '3.x'
+          check-latest: true
+
+      - name: Report selected version
+        run: echo '${{ steps.latest.outputs.python-version }}'
+
+      - name: Look for hg
+        run: hg --version
+
+      - name: Run tests on 3.x
+        run: make -C t
+
+  code-quality:
+    name: Run code quality checks
     runs-on: ubuntu-latest
 
     steps:
@@ -19,9 +69,6 @@ jobs:
         fetch-depth: 1
         submodules: 'recursive'
 
-    - name: Run tests
-      run: make -C t
-
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2
       with: