import { swapItems } from './swapItems';

describe('swapItems', () => {
  test('should swap two items in a list but not modify the original list', () => {
    const list = [1, 2, 3, 4, 5];
    const updatedList = swapItems(list, 2, 4);
    expect(updatedList).toEqual([1, 2, 5, 4, 3]);
    expect(list).toEqual([1, 2, 3, 4, 5]);
  });

  test('should throw an error if the index is out of bounds', () => {
    const list = [1, 2, 3, 4, 5];
    expect(() => swapItems(list, 2, 5)).toThrowError('Invalid index');
  });
});