$url = $u;
$u =~ s/;UIDVALIDITY=(\d+)\s*/;UIDVALIDITY=9$1/s;
ok(!lei('import', $u), 'UIDVALIDITY mismatch in URL rejected');
+ like($lei_err, qr/UIDVALIDITY mismatch/, 'mismatch noted');
lei_ok('inspect', $url);
my $inspect = json_utf8->decode($lei_out);