Migration for #4531

src/TextUI/XmlConfiguration/Migration/MigrationBuilder.php

@@ -42,6 +42,7 @@ final class MigrationBuilder
 
         '9.5' => [
             RemoveListeners::class,
+            RemoveTestSuiteLoaderAttributes::class,
         ],
     ];
 

src/TextUI/XmlConfiguration/Migration/Migrations/RemoveTestSuiteLoaderAttributes.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\TextUI\XmlConfiguration;
+
+use DOMDocument;
+
+/**
+ * @internal This class is not covered by the backward compatibility promise for PHPUnit
+ */
+final class RemoveTestSuiteLoaderAttributes implements Migration
+{
+    public function migrate(DOMDocument $document): void
+    {
+        $root = $document->documentElement;
+
+        if ($root->hasAttribute('testSuiteLoaderClass')) {
+            $root->removeAttribute('testSuiteLoaderClass');
+        }
+
+        if ($root->hasAttribute('testSuiteLoaderFile')) {
+            $root->removeAttribute('testSuiteLoaderFile');
+        }
+    }
+}

tests/_files/XmlConfigurationMigration/input-9.5.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd">
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+         testSuiteLoaderClass="Foo"
+         testSuiteLoaderFile="Foo.php">
 
     <listeners>
         <listener class="MyListener" file="/optional/path/to/MyListener.php">