code: def test_memory_usage(self):
      df = tm.SubclassedDataFrame(
          {"A": [1, 2, 3], "B": [4, 5, 6], "C": [7, 8, 9]}
      )
      result = df.memory_usage()
      assert isinstance(result, tm.SubclassedSeries)
  
      result = df.memory_usage(index=False)
      assert isinstance(result, tm.SubclassedSeries)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 24 for calling the TestDataFrameSubclassing obj's underlying member method code with example usage: obj.test_memory_usage() without return types