def test_reflect_vector_at_slanted_surface(self):
v = Vector(0, -1, 0)
n = Vector(sqrt(2) / 2, sqrt(2) / 2, 0)
r = v.reflect(n)
assert r == Vector(1, 0, 0)
def test_reflect_vector_at_45(self):
v = Vector(1, -1, 0)
n = Vector(0, 1, 0)
r = v.reflect(n)
assert r == Vector(1, 1, 0)