diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
index ffe6027046158..ef615dc38f166 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
@@ -612,7 +612,11 @@ public function testPrependExtensionConfig()
         $loader->load('extensions/services1.xml');
 
         $expected = [
-            ['foo' => 'ping'],
+            [
+                'foo' => 'ping',
+                'another' => null,
+                'another2' => '%project.parameter.foo%',
+            ],
             ['foo' => 'bar'],
         ];
         $this->assertSame($expected, $container->getExtensionConfig('http://www.example.com/schema/project'));