code: def test_complete_subcommands_subapp2(self, argcomplete_on):
      app = MainApp()
      try:
          assert set(self.run_completer(app, "app subapp2 --")) > {
              "--Application.",
              "--SubApp2.",
          }
      finally:
          SubApp2.clear_instance()
  
imports: import io
  import os
  import typing
  import pytest
  from traitlets import Unicode
  from traitlets.config.application import Application
  from traitlets.config.configurable import Configurable
  from traitlets.config.loader import KVArgParseConfigLoader
label_desc: Use image node_id 7 for calling the TestArgcomplete obj's underlying member method code with example usage: obj.test_complete_subcommands_subapp2(argcomplete_on) without return types