using forTemplate() instead of (string) casting fixes unit test

code/model/editableformfields/EditableLiteralField.php

@@ -145,7 +145,7 @@ class EditableLiteralField extends EditableFormField
                 Convert::raw2htmlname($this->Name),
                 Convert::raw2att($classes),
                 $label,
-                (string)$this->dbObject('Content')
+                $this->dbObject('Content')->forTemplate()
             )
         );