code: def post_init(self):
      time.sleep(4)
  
file_path: jina/tests/unit/orchestrate/flow/flow-construct/test_flow_start_noblock.py
imports: import time
  import pytest
  from jina.excepts import RuntimeFailToStart
  from jina.serve.executors import BaseExecutor
  from jina import Flow
  from jina.logging.profile import TimeContext
label_desc: Use image node_id 1 for calling the SlowExecutor obj's underlying member method code with example usage: obj.post_init() without return types