def test12_symdifference(self):
"Testing sym_difference()."
for i in xrange(len(self.geometries.topology_geoms)):
a = OGRGeometry(self.geometries.topology_geoms[i].wkt_a)
b = OGRGeometry(self.geometries.topology_geoms[i].wkt_b)
d1 = OGRGeometry(self.geometries.sdiff_geoms[i].wkt)
d2 = a.sym_difference(b)
self.assertEqual(d1, d2)
self.assertEqual(d1, a ^ b) # __xor__ is symmetric difference operator
a ^= b # testing __ixor__
self.assertEqual(d1, a)
