code: def test_ARIMA_pred_quantiles_insample():
      """Test ARIMA predict_quantiles with in-sample fh.
  
      Failure condition of #4468.
      """
      y = load_airline()
      forecaster = ARIMA(order=(1, 1, 0), seasonal_order=(0, 1, 0, 12))
      forecaster.fit(y)
      forecaster.predict_quantiles(
          fh=y.index, X=None, alpha=[0.05, 0.95]
      )
  
imports: import pytest
  from sktime.datasets import load_airline
  from sktime.forecasting.arima import ARIMA
  from sktime.tests.test_switch import run_test_for_class
label_desc: Use image node_id 1 for calling a global function with example usage: test_ARIMA_pred_quantiles_insample() without return types