add test

Author: teogeb

.github/workflows/ci.yml

@@ -9,7 +9,6 @@ on:
 jobs:
   validate:
     runs-on: ubuntu-latest
-
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -25,3 +24,22 @@ jobs:
         run: npm run test
       - name: Run packaging smoke test
         run: npx @vscode/vsce package
+
+  old-version-support:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Git 2.25.1
+        run: |
+          echo "deb http://archive.ubuntu.com/ubuntu focal-updates main universe" | sudo tee /etc/apt/sources.list.d/focal.list
+          sudo apt-get update
+          sudo apt-get install --allow-downgrades -y git=1:2.25.1-1ubuntu3.13 git-man=1:2.25.1-1ubuntu3.13
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install dependencies
+        run: npm ci
+      - name: Run unit tests
+        run: npm run test