diff -r 4b426ae96ff2 -r c9318beb7c1a tests/test-py3-commands.t
--- a/tests/test-py3-commands.t	Thu Jun 01 01:41:34 2017 +0530
+++ b/tests/test-py3-commands.t	Thu Jun 01 22:24:15 2017 +0900
@@ -137,6 +137,20 @@
   update: (current)
   phases: 2 draft
 
+Test weird unicode-vs-bytes stuff
+
+  $ $PYTHON3 $HGBIN help | egrep -v '^ |^$'
+  Mercurial Distributed SCM
+  list of commands:
+  additional help topics:
+  (use 'hg help -v' to show built-in aliases and global options)
+
+  $ $PYTHON3 $HGBIN help help | egrep -v '^ |^$'
+  hg help [-ecks] [TOPIC]
+  show help for a given topic or a help overview
+  options ([+] can be repeated):
+  (some details hidden, use --verbose to show complete help)
+
 Prove the repo is valid using the Python 2 `hg`:
   $ hg verify
   checking changesets