const expect = require('expect'); const xProd = require('./xProd.js'); test('Testing xProd', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof xProd === 'function').toBeTruthy(); expect(xProd([1, 2], ['a', 'b'])).toEqual([[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]); });