text: import { expect } from 'chai';
  import { sumMultiplesUpTo } from '../../src/lib';
  
  describe('sumMultiplesUpTo', () => {
    it('gives proper sum of multiples of 3 OR 5 up to 100', () => {
      expect(sumMultiplesUpTo(100, [3, 5])).to.eql(2418);
    });
  
    it('gives proper sum of multiples of 3 AND 5 up to 100', () => {
      expect(sumMultiplesUpTo(100, [3, 5], { all: true })).to.eql(315);
    });
  });
  