$im = PublicInbox::V2Writable->new($ibx, 1);
is($im->{partitions}, 1, 'detected single partition from previous');
my $smsg = $im->remove($mime, 'test removal');
$im = PublicInbox::V2Writable->new($ibx, 1);
is($im->{partitions}, 1, 'detected single partition from previous');
my $smsg = $im->remove($mime, 'test removal');