code: def test_predict_fail():
      X = np.array([[1], [2], [3]])
      est = BlankRegressor()
      est._is_fitted = False
      assert_raises(
          AttributeError, "Model is not fitted, yet.", est.predict, X
      )
  
file_path: mlxtend/mlxtend/_base/tests/test_regressor.py
imports: import numpy
  from mlxtend._base import _BaseModel, _Regressor
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 3 for calling a global function with example usage: test_predict_fail() without return types