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); }