import { mergeTwoLists } from '../../src/list/merge-two-sorted-lists'

function ListNode (val) {
  this.val = val
  this.next = null
}

const arrToList = (arr) => {
  const head = new ListNode(arr[0])
  let current = head
  for (let n = 1, len = arr.length; n < len; n++) {
    current.next = new ListNode(arr[n])
    current = current.next
  }

  return head
}

test('合并两个有序链表', () => {
  expect(mergeTwoLists(arrToList([1, 2, 4]), arrToList([1, 3, 4]))).toEqual(arrToList([1, 1, 2, 3, 4, 4]))
  expect(mergeTwoLists(arrToList([null]), arrToList([0, 3, 3, null]))).toEqual(arrToList([0, 3, 3, null]))
  expect(mergeTwoLists(arrToList([1, 3, 8, 11, 15, null]), arrToList([2, null]))).toEqual(arrToList([1, 2, 3, 8, 11, 15, null]))
})