code: def test_get_estimator_regressor():
      """Test get_estimator of Regressor class."""
      regressor = Regressor()
      estimator = regressor.get_estimator()
      assert isinstance(estimator, type(LGBMRegressor()))
  
file_path: MLBox/tests/test_regressor.py
imports: import pytest
  import pandas
  import numpy
  from mlbox.model.regression.regressor import Regressor
  from lightgbm import LGBMRegressor
label_desc: Use image node_id 9 for calling a global function with example usage: test_get_estimator_regressor() without return types