def test_chain_connections():
l = [1, 2, 3]
val = chain(l)
first = next(val)
second = next(val)
assert_equals(first[1], second[0])
def test_chain_groups_2_items():
l = [1, 2]
val = list(chain(l))
assert_equals(len(val), 1)
def split(self, count=2):
points = self.as_points(count + 1)
for p1, p2 in chain(points):
yield Line(p1, p2)