+ ok($sto->can('ipc_do'), 'ipc_do works if we have Storable');
+ $eml->header_set('Message-ID', '<ipc-test@example>');
+ my $pid = $sto->ipc_worker_spawn('lei-store');
+ ok($pid > 0, 'got a worker');
+ my $smsg = $sto->ipc_do('set_eml', $eml, { kw => [ qw(seen) ] });
+ is(ref($smsg), 'PublicInbox::Smsg', 'set_eml works over ipc');
+ my $ids = $sto->ipc_do('set_eml', $eml, { kw => [ qw(seen) ] });
+ is_deeply($ids, [ $smsg->{num} ], 'docid returned');
+
+ $eml->header_set('Message-ID');
+ my $no_mid = $sto->ipc_do('set_eml', $eml, { kw => [ qw(seen) ] });
+ my $wait = $sto->ipc_do('done');
+ my @kw = $sto->search->msg_keywords($no_mid->{num});
+ is_deeply(\@kw, [qw(seen)], 'ipc set changed kw');
+
+ is(ref($smsg), 'PublicInbox::Smsg', 'no mid works ipc');
+ $ids = $sto->ipc_do('set_eml', $eml, { kw => [ qw(seen) ] });
+ is_deeply($ids, [ $no_mid->{num} ], 'docid returned w/o mid w/ ipc');
+ $sto->ipc_do('done');
+ $sto->ipc_worker_stop;
+ $ids = $sto->ipc_do('set_eml', $eml, { kw => [ qw(seen answered) ] });
+ is_deeply($ids, [ $no_mid->{num} ], 'docid returned w/o mid w/o ipc');
+ $wait = $sto->ipc_do('done');
+
+ my $lse = $sto->search;
+ @kw = $lse->msg_keywords($no_mid->{num});
+ is_deeply(\@kw, [qw(answered seen)], 'set changed kw w/o ipc');
+ is($lse->kw_changed($eml, [qw(answered seen)]), 0,
+ 'kw_changed false when unchanged');
+ is($lse->kw_changed($eml, [qw(answered seen flagged)]), 1,
+ 'kw_changed true when +flagged');
+ is($lse->kw_changed(eml_load('t/plack-qp.eml'), ['seen']), undef,
+ 'kw_changed undef on unknown message');