@Test
public void Test3() {
int[] nums = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
ListNode head = ListNode.constructLinkedList(nums);
ListNode actual = solution.swapPairs(head);
int[] exps = {2, 1, 4, 3, 6, 5, 8, 7, 10, 9};
ListNode expected = ListNode.constructLinkedList(exps);
assertTrue(ListNode.isSameList(actual, expected));
}
