code: def test_dot(self):
      df = tm.SubclassedDataFrame([[0, 1, -2, -1], [1, 1, 1, 1]])
      s = tm.SubclassedSeries([1, 1, 2, 1])
      result = df.dot(s)
      assert isinstance(result, tm.SubclassedSeries)
  
      df = tm.SubclassedDataFrame([[0, 1, -2, -1], [1, 1, 1, 1]])
      s = tm.SubclassedDataFrame([1, 1, 2, 1])
      result = df.dot(s)
      assert isinstance(result, tm.SubclassedDataFrame)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 23 for calling the TestDataFrameSubclassing obj's underlying member method code with example usage: obj.test_dot() without return types