use_ok 'PublicInbox::InboxWritable', qw(eml_from_path);
is(eml_from_path('.'), undef, 'eml_from_path fails on directory');
+is_deeply([PublicInbox::MdirReader::flags2kw('S')], [{ 'seen' => 1 }, []],
+ "`seen' kw set from flag");
+is_deeply([PublicInbox::MdirReader::flags2kw('Su')], [{ 'seen' => 1 }, ['u']],
+ 'unknown flag ignored');
+
done_testing;