test matrix

Author: peterfox

.github/workflows/run-tests.yml

@@ -18,9 +18,10 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest]
         php: [8.4]
+        phpunit: [10.*, 11.*, 12.*]
         stability: [prefer-lowest, prefer-stable]
 
-    name: P${{ matrix.php }} - ${{ matrix.stability }} - ${{ matrix.os }}
+    name: P${{ matrix.php }} - PHPUnit:${{ matrix.phpunit }} - ${{ matrix.stability }} - ${{ matrix.os }}
 
     steps:
       - name: Checkout code
@@ -39,7 +40,9 @@ jobs:
           echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
       - name: Install dependencies
-        run: composer update --${{ matrix.stability }} --prefer-dist --no-interaction
+        run: |
+          composer require "phpunit/phpunit:${{ matrix.phpunit }}" --no-interaction --no-update
+          composer update --${{ matrix.stability }} --prefer-dist --no-interaction
 
       - name: List Installed Dependencies
         run: composer show -D