Ensure stringification of ListValueInterface values

Author: tvdijen

tests/InterOperability/EntitiesDescriptorTest.php

@@ -53,9 +53,6 @@ private function parseMetadata(DOMElement $metadata): void
 
             foreach ($descriptors as $descriptor) {
                 /** @var \DOMElement $descriptor */
-                if (strval($descriptor->getEntityID()) === 'https://sb.kr-vysocina.cz/idp/shibboleth') {
-var_dump($descriptor);
-                }
                 $this->parseMetadata($descriptor);
             }
         } elseif ($metadata->localName === 'EntityDescriptor') {
@@ -65,6 +62,9 @@ private function parseMetadata(DOMElement $metadata): void
             try {
                 EntityDescriptor::fromXML($metadata);
             } catch (Exception $e) {
+                if ($entityID() === 'https://sb.kr-vysocina.cz/idp/shibboleth') {
+var_dump($descriptor);
+                }
                 $this->failures = $this->failures + 1;
 
                 echo "EntityID: " . $entityID[0]->value . PHP_EOL;