def test_sum(self):
point = LatLon(1, 2)
point_to_sum = LatLon(3, 4)
expected_result = LatLon(4, 6)
self.assertEqual(point.sum(point_to_sum), expected_result)
def test_sum_exceeding_maximal_latitud(self):
point = LatLon(45, 30)
point_to_sum = LatLon(60, 20)
expected_result = LatLon(75, -130)
self.assertEqual(point.sum(point_to_sum), expected_result)
