code: def test_subclass_unstack(self):
      # GH 15564
      s = tm.SubclassedSeries(
          [1, 2, 3, 4], index=[list("aabb"), list("xyxy")]
      )
  
      res = s.unstack()
      exp = tm.SubclassedDataFrame(
          {"x": [1, 3], "y": [2, 4]}, index=["a", "b"]
      )
  
      tm.assert_frame_equal(res, exp)
  
file_path: pandas/pandas/tests/series/test_subclass.py
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestSeriesSubclassing obj's underlying member method code with example usage: obj.test_subclass_unstack() without return types