code: def test_to_dict_raises_attribute_error_on_unfit_model():
      modl = ARIMA(order=(1, 1, 0))
      with pytest.raises(AttributeError):
          modl.to_dict()
  
imports: import numpy
  import pandas
  from pmdarima.arima import ARIMA, auto_arima, AutoARIMA, ARMAtoMA
  from pmdarima.arima import _validation
  from pmdarima.compat.pytest import pytest_error_str
  from pmdarima.datasets import load_lynx, load_wineind, load_heartrate
  from numpy.random import RandomState
  from numpy.testing import assert_array_almost_equal, assert_almost_equal, assert_allclose
  from statsmodels import api
  from sklearn.metrics import mean_squared_error
  import datetime
  import joblib
  import os
  import pickle
  import pytest
  import tempfile
  import time
label_desc: Use image node_id 20 for calling a global function with example usage: test_to_dict_raises_attribute_error_on_unfit_model() without return types