In reply to stanley_sam:
You should never run a default sequence, as it is very difficult to debug (as you are finding out), and it isn’t very reusable. Instead, you should start() the sequence as part of a test. If it needs to run as a background sequence, it should be forked() as required.
The problem with what you are trying to accomplish is that there are no objections in the main_phase. Therefore, the main_phase immediately exits and your sequence is killed before it is expected. If you change the run_phase() in your test to main_phase(), you will see the sequence run correctly.