text: 'use strict';
  
  var assert = require('assert');
  var add = require('./add');
  
  describe('add operation', function() {
    it('can add', function() {
      assert(add(1, 1) === 2);
      assert(add(2, 2) === 4);
      assert(add(3, 5) === 8);
    });
  });
  