Function edge

61. Rotate List/src/main.rs:111–120

()

    #[test]
    fn edge() {
        assert_eq!(
            Solution::rotate_right(None, 4),
            None
        );
        assert_eq!(
            Solution::rotate_right(Some(Box::new(ListNode { val: 1, next: None })), 1),
            Some(Box::new(ListNode { val: 1, next: None }))
        )
    }
}