$res = $cb->(GET('/v2test/reuse@mid/T/'));
$raw = $res->content;
like($raw, qr/\b4\+ messages\b/, 'thread overview shown with /T/');
+ my @over = ($raw =~ m/^\d{4}-\d+-\d+\s+\d+:\d+ (.+)$/gm);
+ is_deeply(\@over, [ '<a', '` <a', '` <a', '` <a' ],
+ 'duplicate messages share the same root');
$res = $cb->(GET('/v2test/reuse@mid/t/'));
$raw = $res->content;