ISTWCMS-7189: Fix test url generator tests

acceptance/WcmsTestsUrlAliasCest.php

@@ -285,9 +285,11 @@ class WcmsTestsUrlAliasCest {
       }
     }
 
-    // Step through each of the nodes used and delete them.
-    foreach ($this->nodesUsed as $node) {
+    // Step through each of the nodes used and delete them
+    // as well as delete it from the nodes used array.
+    foreach ($this->nodesUsed as $title => $node) {
       $node->delete();
+      unset($this->nodesUsed[$title]);
     }
   }