is_deeply([ $mime->header('Xref') ], [ 'example.com test:1' ],
'Xref: set');
- $ibx->{-base_url} = 'http://mirror.example.com/m/';
$smsg->{num} = 2;
PublicInbox::NNTP::set_nntp_headers($hdr, $smsg);
is_deeply([ $mime->header('Message-ID') ], [ "<$mid>" ],