code: def feature():
      unit_circle = sgeom.Point(0, 0).buffer(0.5)
      unit_square = unit_circle.envelope
      geoms = [unit_circle, unit_square]
      feature = ShapelyFeature(geoms, ccrs.PlateCarree())
      return feature
  
file_path: cartopy/lib/cartopy/tests/mpl/test_feature_artist.py
imports: from unittest import mock
  from matplotlib.transforms import IdentityTransform
  import numpy
  import pytest
  import shapely.geometry
  import cartopy.crs
  from cartopy.feature import ShapelyFeature
  from cartopy.mpl import style
  from cartopy.mpl.feature_artist import FeatureArtist, _freeze, _GeomKey
  import cartopy.mpl.geoaxes
label_desc: Use image node_id 2 for calling a global function with example usage: feature() and returns: feature