my $im = PublicInbox::V2Writable->new($ibx, {nproc => 1});
is($im->{shards}, 1, 'one shard when forced');
ok($im->add($mime), 'ordinary message added');
my $im = PublicInbox::V2Writable->new($ibx, {nproc => 1});
is($im->{shards}, 1, 'one shard when forced');
ok($im->add($mime), 'ordinary message added');