Merge branch '9.6' into 10.5

Author: sebastianbergmann

src/TextUI/Configuration/Xml/Loader.php

@@ -26,6 +26,7 @@
 use function trim;
 use DOMDocument;
 use DOMElement;
+use DOMNode;
 use DOMXPath;
 use PHPUnit\Runner\TestSuiteSorter;
 use PHPUnit\Runner\Version;
@@ -514,6 +515,8 @@ private function readFilterFiles(string $filename, DOMXPath $xpath, string $quer
         $files = [];
 
         foreach ($xpath->query($query) as $file) {
+            assert($file instanceof DOMNode);
+
             $filePath = $file->textContent;
 
             if ($filePath) {
@@ -530,10 +533,14 @@ private function groups(DOMXPath $xpath): Groups
         $exclude = [];
 
         foreach ($xpath->query('groups/include/group') as $group) {
+            assert($group instanceof DOMNode);
+
             $include[] = new Group($group->textContent);
         }
 
         foreach ($xpath->query('groups/exclude/group') as $group) {
+            assert($group instanceof DOMNode);
+
             $exclude[] = new Group($group->textContent);
         }
 
@@ -599,6 +606,8 @@ private function php(string $filename, DOMXPath $xpath): Php
         $includePaths = [];
 
         foreach ($xpath->query('php/includePath') as $includePath) {
+            assert($includePath instanceof DOMNode);
+
             $path = $includePath->textContent;
 
             if ($path) {