text: const fromLast = require('./index');
  const L = require('./linkedlist');
  const List = L.LinkedList;
  const Node = L.Node;
  
  test('fromLast is a function', () => {
    expect(typeof fromLast).toEqual('function');
  });
  
  test('fromLast returns the node n elements from the end', () => {
    const l = new List();
  
    l.insertLast('a');
    l.insertLast('b');
    l.insertLast('c');
    l.insertLast('d');
    l.insertLast('e');
  
    expect(fromLast(l, 3).data).toEqual('b');
  });
  