code: def create_basic_app(cls, bundles=None, _config_overrides=None):
          
          bundles = bundles or []
          name = bundles[-1].module_name if bundles else 'basic_app'
          app = FlaskUnchained(name, template_folder=os.path.join(
              os.path.dirname(__file__), 'templates'))
  
          for bundle in bundles:
              bundle.before_init_app(app)
  
          unchained.init_app(app, DEV, bundles, _config_overrides=_config_overrides)
  
          for bundle in bundles:
              bundle.after_init_app(app)
  
          return app
docs: Creates a "fake" app for use while developing