docstr: Test that function returns a GeoSeries if GeoSeries is passed.
code: def test_returns_series(self, point_gdf, mask):
      """Test that function returns a GeoSeries if GeoSeries is passed."""
      out = clip(point_gdf.geometry, mask)
      assert isinstance(out, GeoSeries)
  
imports: import numpy
  import shapely
  from shapely.geometry import Polygon, Point, LineString, LinearRing, GeometryCollection, MultiPoint, box
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries, clip
  from geopandas.testing import assert_geodataframe_equal, assert_geoseries_equal
  import pytest
  from geopandas.tools.clip import _mask_is_list_like_rectangle
label_desc: Use image node_id 3 for calling the TestClipWithSingleRectangleGdf obj's underlying member method code with example usage: obj.test_returns_series(point_gdf, mask) without return types