from shapely.geometry import MultiPolygon, Point, Polygon
def test_empty_polygon():
"""No constructor arg makes an empty polygon geometry."""
assert Polygon().is_empty
def test_empty_multipolygon():
"""No constructor arg makes an empty multipolygon geometry."""
assert MultiPolygon().is_empty
def test_multipolygon_empty_polygon():
"""An empty polygon passed to MultiPolygon() makes an empty
multipolygon geometry."""
assert MultiPolygon([Polygon()]).is_empty
def test_multipolygon_empty_among_polygon():
"""An empty polygon passed to MultiPolygon() is ignored."""
assert len(MultiPolygon([Point(0, 0).buffer(1.0), Polygon()]).geoms) == 1