def METHOD_NAME(dash_duo):
    app = Dash(__name__)
    app.layout = html.Div(
        [html.Div("Hi", id="in"), html.Div(id="out1"), html.Div(id="out2")]
    )
    @app.callback(Output("out1", "children"), Input("in", "children"))
    def o1(i):
        return "1: " + i
    @app.callback([Output("out2", "children")], [Input("in", "children")])
    def o2(i):
        return ("2: " + i,)
    dash_duo.start_server(app)
    dash_duo.wait_for_text_to_equal("#out1", "1: Hi")
    dash_duo.wait_for_text_to_equal("#out2", "2: Hi")