const expect = require('expect'); const deepFlatten = require('./deepFlatten.js'); test('Testing deepFlatten', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof deepFlatten === 'function').toBeTruthy(); expect(deepFlatten([1, [2], [[3], 4], 5])).toEqual([1, 2, 3, 4, 5]); });