code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.feature_selection.GenericUnivariateSelect,
          fs.GenericUnivariateSelect,
      )
      self.assertIs(
          df.feature_selection.SelectPercentile, fs.SelectPercentile
      )
      self.assertIs(df.feature_selection.SelectKBest, fs.SelectKBest)
      self.assertIs(df.feature_selection.SelectFpr, fs.SelectFpr)
      self.assertIs(
          df.feature_selection.SelectFromModel, fs.SelectFromModel
      )
      self.assertIs(df.feature_selection.SelectFdr, fs.SelectFdr)
      self.assertIs(df.feature_selection.SelectFwe, fs.SelectFwe)
      self.assertIs(df.feature_selection.RFE, fs.RFE)
      self.assertIs(df.feature_selection.RFECV, fs.RFECV)
      self.assertIs(
          df.feature_selection.VarianceThreshold, fs.VarianceThreshold
      )
  
file_path: pandas-ml/pandas_ml/skaccessors/test/test_feature_selection.py
imports: import pytest
  import sklearn.datasets
  import sklearn.feature_selection
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestFeatureSelection obj's underlying member method code with example usage: obj.test_objectmapper() without return types