code: def test_series_to_frame(self):
      orig = Series([1, 2, 3])
      expected = orig.to_frame()
      result = SimpleSeriesSubClass(orig).to_frame()
  
      assert (
          type(result) is DataFrame
      )  # assert_frame_equal only checks isinstance(lhs, type(rhs))
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestSubclassWithoutConstructor obj's underlying member method code with example usage: obj.test_series_to_frame() without return types