text: import LinkedList from '../../../../data-structures/linked-list/LinkedList';
  import traversal from '../traversal';
  
  describe('traversal', () => {
    it('should traverse linked list', () => {
      const linkedList = new LinkedList();
  
      linkedList
        .append(1)
        .append(2)
        .append(3);
  
      const traversedNodeValues = [];
      const traversalCallback = (nodeValue) => {
        traversedNodeValues.push(nodeValue);
      };
  
      traversal(linkedList, traversalCallback);
  
      expect(traversedNodeValues).toEqual([1, 2, 3]);
    });
  });
  