const expect = require('expect'); const differenceWith = require('./differenceWith.js'); test('Testing differenceWith', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof differenceWith === 'function').toBeTruthy(); expect( differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b)) ).toEqual([1, 1.2]); });