diff -r 8d6ab33a61b2 -r 803b7569c9ea tests/test-hgweb-json.t
--- a/tests/test-hgweb-json.t	Fri Sep 28 23:17:06 2018 -0400
+++ b/tests/test-hgweb-json.t	Sat Sep 29 02:02:35 2018 -0400
@@ -2201,7 +2201,7 @@
 Commit message with null character
 
   $ echo foo >> da/foo
-  >>> open('msg', 'wb').write('commit with null character: \0\n')
+  >>> open('msg', 'wb').write('commit with null character: \0\n') and None
   $ hg ci -l msg
   $ rm msg