def test_coverage_union_overlapping_inputs():
polygon = Geometry("POLYGON ((1 1, 1 0, 0 0, 0 1, 1 1))")
# Overlapping polygons raise an error
with pytest.raises(
shapely.GEOSException,
match="CoverageUnion cannot process incorrectly noded inputs.",
):
shapely.coverage_union(
polygon, Geometry("POLYGON ((1 0, 0.9 1, 2 1, 2 0, 1 0))"))
def test_coverage_union_reduce_1dim(n):
"""
This is tested seperately from other set operations as it differs in two ways:
1. It expects only non-overlapping polygons
2. It expects GEOS 3.8.0+
"""
test_data = [
shapely.box(0, 0, 1, 1),
shapely.box(1, 0, 2, 1),
shapely.box(2, 0, 3, 1),
]
actual = shapely.coverage_union_all(test_data[:n])
# perform the reduction in a python loop and compare
expected = test_data[0]
for i in range(1, n):
expected = shapely.coverage_union(expected, test_data[i])
assert_geometries_equal(actual, expected, normalize=True)
def test_coverage_union_non_polygon_inputs(geom_1, geom_2):
# Non polygon geometries raise an error
with pytest.raises(shapely.GEOSException,
match="Unhandled geometry type in CoverageUnion."):
shapely.coverage_union(geom_1, geom_2)