public void MergeTwoLists_FirstCase_True()
{
var list1 = new ListNode(3);
var node3 = new ListNode(3);
var node5 = new ListNode(5);
list1.next = node3;
node3.next = node5;
var list2 = new ListNode(1);
var node1 = new ListNode(1);
var node2 = new ListNode(2);
var node6 = new ListNode(6);
list2.next = node1;
node1.next = node2;
node2.next = node6;
var expectedOutput = "1,1,2,3,3,5,6";
var output = _linkedListService.MergeTwoLists(list1, list2);
var actualOutput = _linkedListService.GetListValues(output);
Assert.Equal(expectedOutput, actualOutput);
}