import unittest
from shapely.geometry import LineString, MultiLineString
from shapely.ops import linemerge
class LineMergeTestCase(unittest.TestCase):
def test_linemerge(self):
lines = MultiLineString([[(0, 0), (1, 1)], [(2, 0), (2, 1), (1, 1)]])
result = linemerge(lines)
assert isinstance(result, LineString)
assert not result.is_ring
assert len(result.coords) == 4
assert result.coords[0] == (0.0, 0.0)
assert result.coords[3] == (2.0, 0.0)
lines2 = MultiLineString([((0, 0), (1, 1)), ((0, 0), (2, 0), (2, 1), (1, 1))])
result = linemerge(lines2)
assert result.is_ring
assert len(result.coords) == 5
lines3 = [
LineString([(0, 0), (1, 1)]),
LineString([(0, 0), (0, 1)]),
]
result = linemerge(lines3)
assert not result.is_ring
assert len(result.coords) == 3
assert result.coords[0] == (0.0, 1.0)
assert result.coords[2] == (1.0, 1.0)
lines4 = [
[(0, 0), (1, 1)],
[(0, 0), (0, 1)],
]
assert result.equals(linemerge(lines4))
lines5 = [
((0, 0), (1, 1)),
((1, 0), (0, 1)),
]
result = linemerge(lines5)
assert result.geom_type == "MultiLineString"