code: def test_app_init(self):
      if not self.app:
          return
      self.app.on_init_complete()
  
file_path: MONAILabel/tests/unit/interfaces/test_app.py
imports: import os
  import unittest
  import torch
  from parameterized import parameterized
  from monailabel.config import settings
  from monailabel.interfaces.app import MONAILabelApp
  from monailabel.interfaces.tasks.batch_infer import BatchInferImageType
  from monailabel.interfaces.utils.app import app_instance
label_desc: Use image node_id 3 for calling the TestApp obj's underlying member method code with example usage: obj.test_app_init() without return types