def test_point_midpoint_from_point():
p = Point(1, 1)
q = Point(2, 2)
r = p.midpoint(q)
s = q.midpoint(p)
assert r.x == 1.5 and r.y == 1.5
assert r == s
def test_point_midpoint_from_origin():
p = Point(1, 1)
o = Point()
r = p.midpoint()
s = o.midpoint(p)
assert r.x == 0.5 and r.y == 0.5
assert s == r
