code: def test_columns(self):
      self.assertEqual(
          set(self.pipeline.columns), set(self.dataframe.columns)
      )
  
file_path: lore/tests/unit/test_pipelines.py
imports: from __future__ import generators
  import unittest
  import pandas
  import tests.mocks.pipelines
label_desc: Use image node_id 3 for calling the TestLowMemory obj's underlying member method code with example usage: obj.test_columns() without return types