code: def test_init_Reg_feature_selector():
      """Test init method of Reg_feature_selector class."""
      feature_selector = Reg_feature_selector()
      assert feature_selector.strategy == "l1"
      assert feature_selector.threshold == 0.3
      assert not feature_selector._Reg_feature_selector__fitOK
      assert feature_selector._Reg_feature_selector__to_discard == []
  
file_path: MLBox/tests/test_regression_feature_selector.py
imports: import pytest
  import pandas
  from mlbox.model.regression.feature_selector import Reg_feature_selector
label_desc: Use image node_id 1 for calling a global function with example usage: test_init_Reg_feature_selector() without return types