text: import LinkedList from '../../../../data-structures/linked-list/LinkedList';
  import reverseTraversal from '../reverseTraversal';
  
  describe('reverseTraversal', () => {
    it('should traverse linked list in reverse order', () => {
      const linkedList = new LinkedList();
  
      linkedList
        .append(1)
        .append(2)
        .append(3);
  
      const traversedNodeValues = [];
      const traversalCallback = (nodeValue) => {
        traversedNodeValues.push(nodeValue);
      };
  
      reverseTraversal(linkedList, traversalCallback);
  
      expect(traversedNodeValues).toEqual([3, 2, 1]);
    });
  });
  
  
  // it('should reverse traversal the linked list with callback', () => {
  //   const linkedList = new LinkedList();
  //
  //   linkedList
  //     .append(1)
  //     .append(2)
  //     .append(3);
  //
  //   expect(linkedList.toString()).toBe('1,2,3');
  //   expect(linkedList.reverseTraversal(linkedList.head, value => value * 2)).toEqual([6, 4, 2]);
  //   expect(() => linkedList.reverseTraversal(linkedList.head)).toThrow();
  // });
  