add test cases for different phpunit version.

Author: Basster

.github/workflows/tests.yml

@@ -15,20 +15,35 @@ jobs:
         php-version: ['8.1', '8.2', '8.3']
         composer-flags: ['']
         symfony-version: ['^6.4']
+        phpunit-version: ['^9.6']
         include:
           - php-version: 7.4
             symfony-version: "^5.4"
             composer-flags: "--prefer-lowest"
           - php-version: 8.1
             symfony-version: "^5.4"
+            phpunit-version: "^10.0"
           - php-version: 8.1
             symfony-version: "^6.4"
+            phpunit-version: "^10.0"
           - php-version: 8.2
             symfony-version: "^6.4"
+            phpunit-version: "^10.0"
           - php-version: 8.2
             symfony-version: "^7.0"
+            phpunit-version: "^10.0"
           - php-version: 8.3
             symfony-version: "^7.0"
+            phpunit-version: "^10.0"
+          - php-version: 8.2
+            symfony-version: "^6.4"
+            phpunit-version: "^11.0"
+          - php-version: 8.2
+            symfony-version: "^7.0"
+            phpunit-version: "^11.0"
+          - php-version: 8.3
+            symfony-version: "^7.0"
+            phpunit-version: "^11.0"
 
     steps:
       - name: Checkout
@@ -65,6 +80,7 @@ jobs:
           symfony/twig-bundle=${{ matrix.symfony-version }}
           symfony/validator=${{ matrix.symfony-version }}
           symfony/yaml=${{ matrix.symfony-version }}
+          phpunit/phpunit=${{ phpunit-version }}
 
       # This is needed to fix builds where the `annotation_reader` service may not be set up if
       # the Annotations package is not in the production dependencies