code: def test_slice(self):
      assert type(self.df[:2]) is GeoDataFrame
      assert type(self.df[::2]) is GeoDataFrame
  
imports: from pandas import DataFrame, Series
  from shapely.geometry import Point
  from geopandas import GeoDataFrame, GeoSeries
label_desc: Use image node_id 6 for calling the TestDataFrame obj's underlying member method code with example usage: obj.test_slice() without return types