public void HasCycle_True()
{
var head = new Node(6);
var node5 = new Node(5);
var node4 = new Node(4);
var node3 = new Node(3);
var node2 = new Node(2);
head.Next = node5;
node5.Next = node4;
node4.Next = node3;
node3.Next = node2;
node2.Next = node4;
var output = _linkedListService.HasCycle(head);
Assert.True(output);
}