minor symfony#58043 [DependencyInjection] fix tests (xabbuh)

This PR was merged into the 7.1 branch.

Discussion
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[DependencyInjection] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 7.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
-------

458ab22 fix tests

Author: xabbuh

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'));