test_replace(2, 'basic', $opt = { %$opt, post => *pad_msgs });
test_replace(2, 'basic', $opt = { %$opt, rotate_bytes => 1 });
test_replace(2, 'basic', $opt = { %$opt, post => *pad_msgs });
test_replace(2, 'basic', $opt = { %$opt, rotate_bytes => 1 });