perl -Ilib t/05_mce_child.t
...
ok 2 - spawning asynchronously
ok 3 - check for unique pids 
ok 4 - check list_running
ok 5 - check list_joinable
ok 6 - check list
ok 7 - check pending
ok 8 - check is_running child1
ok 9 - check is_joinable child1
ok 10 - check is_running child2
ok 11 - check is_joinable child2
ok 12 - check is_running child3
ok 13 - check is_joinable child3
...