--- a/tests/test-subrepo.t	Sun Oct 06 09:45:02 2019 -0400
+++ b/tests/test-subrepo.t	Sun Oct 06 09:48:39 2019 -0400
@@ -1119,7 +1119,7 @@
 Ensure a full traceback, not just the SubrepoAbort part
 
   $ hg -R issue1852b update --traceback 2>&1 | grep 'raise error\.Abort'
-      raise error.Abort(_("default path for subrepository not found"))
+      raise error.Abort(_(b"default path for subrepository not found"))
 
 Pull -u now doesn't help