code: def test_default_configuration(self):
      transformation, original = _test_preprocessing(
          dataset="boston",
          Preprocessor=SelectPercentileRegression,
      )
      self.assertEqual(transformation.shape[0], original.shape[0])
      self.assertEqual(
          transformation.shape[1], int(original.shape[1] / 2)
      )
      self.assertFalse((transformation == 0).all())
  
file_path: auto-sklearn/test/test_pipeline/components/feature_preprocessing/test_select_percentile_regression.py
imports: import numpy
  from autosklearn.pipeline.components.feature_preprocessing.select_percentile_regression import SelectPercentileRegression
  from autosklearn.pipeline.util import _test_preprocessing, get_dataset
  import unittest
label_desc: Use image node_id 1 for calling the SelectPercentileRegressionTest obj's underlying member method code with example usage: obj.test_default_configuration() without return types