$IkiWiki::config{wikiname} = 'ASCII';
is(debug('test'), '', 'plain ASCII syslog');
-$IkiWiki::config{wikiname} = 'not ⒶSCII';
-is(debug('test'), '', 'UTF8 syslog');
+$IkiWiki::config{wikiname} = 'not ⒶSCII and has %s in it';
+is(debug('𝗧ĕṡҭ'), '', 'UTF8 syslog');
my $orig = $IkiWiki::config{wikiname};
is(debug('test'), '', 'check for idempotency');
is($IkiWiki::config{wikiname}, $orig, 'unchanged config');