def test_scale_world_origin():
"""Test the Plane scale method with None origin."""
pt = Point3D(2, 2, 2)
vec = Vector3D(0, 2, 0)
plane = Plane(vec, pt)
new_plane = plane.scale(2)
assert new_plane.o == Point3D(4, 4, 4)
assert new_plane.n == Point3D(0, 1, 0)
assert new_plane.x == plane.x
assert new_plane.y == plane.y
assert new_plane.k == 4
def test_scale():
"""Test the Plane scale method."""
pt = Point3D(2, 2, 2)
vec = Vector3D(0, 2, 0)
plane = Plane(vec, pt)
origin_1 = Point3D(0, 2, 2)
origin_2 = Point3D(1, 1, 2)
new_plane = plane.scale(2, origin_1)
assert new_plane.o == Point3D(4, 2, 2)
assert new_plane.n == Point3D(0, 1, 0)
assert new_plane.x == plane.x
assert new_plane.y == plane.y
assert new_plane.k == 2
new_plane = plane.scale(2, origin_2)
assert new_plane.o == Point3D(3, 3, 2)
assert new_plane.n == Point3D(0, 1, 0)
assert new_plane.x == plane.x
assert new_plane.y == plane.y
assert new_plane.k == 3
