code: def test_stationarity_adf():
      """Test StationarityADF on airline data, identical to docstring example."""
      X = load_airline()
      sty_est = StationarityADF()
      sty_est.fit(X)
      assert not sty_est.get_fitted_params()["stationary"]
  
imports: import pytest
  from sktime.datasets import load_airline
  from sktime.param_est.stationarity import StationarityADF, StationarityKPSS
  from sktime.utils.validation._dependencies import _check_estimator_deps
label_desc: Use image node_id 1 for calling a global function with example usage: test_stationarity_adf() without return types