AddInTailTest

    private static void testLinkedListAddInTailWorksProperly() {
        LinkedList list = new LinkedList();
        Node node = new Node(0);
        list.addInTail(node);
        test(
                list.count() == 1,
                "List should have at least one element after adding one node to it"
        );
        test(
                list.head == node,
                "List head should be equal to node"
        );
        test(
                list.tail == node,
                "List tail should be equal to node"
        );

        Node node1 = new Node(1);
        list.addInTail(node1);
        test(
                list.count() == 2,
                "List should have two elements after adding two nodes to it"
        );
        test(
                list.head == node,
                "List head still should be equal to node"
        );
        test(
                list.tail == node1,
                "List tail should become node1"
        );
    }