text: const CaeserCipher = require('./CaeserCipher');
  
  describe('Is a caeser cipher possible', () => {
    test('can it reverse a string using a positive number', () => {
      expect(CaeserCipher('Zoo Keeper', 2)).toEqual('Bqq Mggrgt');
    });
  
    test('can it reverse using a negative number', () => {
      expect(CaeserCipher('Zoo Keeper', -2)).toEqual('Xmm Iccncp');
    });
  });
  