Debug test for stopping whole process group

Author: Martchus

t/01_run.t

@@ -498,6 +498,8 @@ subtest stop_whole_process_group_gracefully => sub {
   my $test_gpid       = getpgrp(0);
   my $sub_process_pid = $sub_process->pid;
   sleep 0.1 while $test_gpid == getpgrp($sub_process_pid);
+  note "test pid: $$, gpid: $test_gpid";
+  note "sub process pid: $sub_process_pid, gpid: " . getpgrp($sub_process_pid);
 
   $sub_process->stop();
   is $sub_process->is_running, 0, 'process is shut down via kill_whole_group';