def test_line_parse(self):
"""
This test exercises the parsing logic our LINESTRING WKT object
@since 1.2
@jira_ticket PYTHON-641
@test_category dse geometric
@expected_result We should be able to form LINESTRINGS objects from properly formatted WKT strings
"""
# Test simple line string
ls = "LINESTRING (1.0 2.0, 3.0 4.0, 5.0 6.0)"
lo = LineString.from_wkt(ls)
lo_expected_cords = ((1.0, 2.0), (3.0, 4.0), (5.0, 6.0))
self.assertEqual(lo.coords, lo_expected_cords)
# Test very long line string
long_ls = self._construct_line_string(10000)
long_lo = LineString.from_wkt(long_ls)
self.assertEqual(len(long_lo.coords), 10000)
self.assertEqual(long_lo.coords,
self._construct_line_string_expected_cords(10000))
# Test line string with negative numbers
ls = "LINESTRING (-1.3 1.2, 3.23 -4.54, 1.34 -9.26)"
lo = LineString.from_wkt(ls)
lo_expected_cords = ((-1.3, 1.2), (3.23, -4.54), (1.34, -9.26))
self.assertEqual(lo.coords, lo_expected_cords)
# Test bad line strings
bls = "LINESTRIN (1.0 2.0, 3.0 4.0, 5.0 6.0)"
with self.assertRaises(ValueError):
blo = LineString.from_wkt(bls)
bls = "LINESTRING (1.0 2.0 3.0 4.0 5.0"
with self.assertRaises(ValueError):
blo = LineString.from_wkt(bls)
# Test with NAN
ls = "LINESTRING (NAN NAN, NAN NAN)"
lo = LineString.from_wkt(ls)
self.assertEqual(len(lo.coords), 2)
for cords in lo.coords:
for cord in cords:
self.assertTrue(math.isnan(cord))
def deserialize(cls, value, reader=None):
return LineString.from_wkt(value)