def test_move_to_xy():
p = Pen()
p.move_to((0, 0))
p.turn_to(-45)
p.move_to_x(1)
assert_points_equal(p.position, (1, -1))
p = Pen()
p.move_to((0, 0))
p.turn_toward((3, 4))
p.move_to_y(8)
assert_points_equal(p.position, (6, 8))
