code: def test_complete_simple_app(self, argcomplete_on):
      app = ArgcompleteApp()
      expected = [
          "--help",
          "--debug",
          "--show-config",
          "--show-config-json",
          "--log-level",
          "--Application.",
          "--ArgcompleteApp.",
      ]
      assert set(self.run_completer(app, "app --")) == set(expected)
  
      # completing class traits
      assert set(self.run_completer(app, "app --App")) > {
          "--Application.show_config",
          "--Application.log_level",
          "--Application.log_format",
      }
  
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 3 for calling the TestArgcomplete obj's underlying member method code with example usage: obj.test_complete_simple_app(argcomplete_on) without return types