content: from dash import Dash, Input, Output, html
  
  from tests.background_callback.utils import get_background_callback_manager
  
  background_callback_manager = get_background_callback_manager()
  handle = background_callback_manager.handle
  
  app = Dash(__name__, background_callback_manager=background_callback_manager)
  
  app.layout = html.Div(
      [
          html.Button("click 1", id="button-1"),
          html.Button("click 2", id="button-2"),
          html.Div(id="output-1"),
          html.Div(id="output-2"),
      ]
  )
  
  
  def gen_callback(index):
      @app.callback(
          Output(f"output-{index}", "children"),
          Input(f"button-{index}", "n_clicks"),
          background=True,
          prevent_initial_call=True,
      )
      def callback_name(_):
          return f"Clicked on {index}"
  
  
  for i in range(1, 3):
      gen_callback(i)
  
  
  if __name__ == "__main__":
      app.run(debug=True)
  