is($lms->set_src($deadbeef, $imap, 1), 1, 'set IMAP once');
ok($lms->set_src($deadbeef, $imap, 1) == 0, 'set IMAP idempotently');
is_deeply([$ro->folders], [$imap], 'IMAP folder added');
is($lms->set_src($deadbeef, $imap, 1), 1, 'set IMAP once');
ok($lms->set_src($deadbeef, $imap, 1) == 0, 'set IMAP idempotently');
is_deeply([$ro->folders], [$imap], 'IMAP folder added');