Fix XML loader errors for Symfony 8

Author: Orest-Divintari

tests/Unit/DependencyInjection/ConfigurationTest.php

@@ -13,6 +13,8 @@
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
+use Symfony\Component\HttpKernel\Kernel;
+use function class_exists;
 
 /**
  * @author David Buchmann <[email protected]>
@@ -322,11 +324,17 @@ public function testSupportsAllConfigFormats(): void
             ],
         ];
 
-        $formats = array_map(fn ($path) => __DIR__.'/../../Resources/Fixtures/'.$path, [
+        $formats = [
             'config/full.yml',
-            'config/full.xml',
             'config/full.php',
-        ]);
+        ];
+
+        // XML configuration is not supported in Symfony 8+
+        if (class_exists('Symfony\Component\DependencyInjection\Loader\XmlFileLoader')) {
+            $formats[] = 'config/full.xml';
+        }
+
+        $formats = array_map(fn ($path) => __DIR__.'/../../Resources/Fixtures/'.$path, $formats);
 
         foreach ($formats as $format) {
             $this->assertProcessedConfigurationEquals($expectedConfiguration, [$format]);