code: def test_get_metafeatures_multiple_features(self):
      mf = self.base.get_metafeatures(
          features=["NumberOfInstances", "NumberOfClasses"]
      )
      self.assertIsInstance(mf, pd.DataFrame)
      self.assertEqual(mf.shape, (132, 2))
  
file_path: auto-sklearn/test/test_metalearning/pyMetaLearn/test_meta_base.py
imports: import logging
  import os
  import pandas
  import autosklearn.pipeline.classification
  from autosklearn.metalearning.metalearning.meta_base import MetaBase
  import unittest
label_desc: Use image node_id 9 for calling the MetaBaseTest obj's underlying member method code with example usage: obj.test_get_metafeatures_multiple_features() without return types