const expect = require('expect'); const mapValues = require('./mapValues.js'); test('Testing mapValues', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof mapValues === 'function').toBeTruthy(); const users = { fred: { user: 'fred', age: 40 }, pebbles: { user: 'pebbles', age: 1 } }; expect(mapValues(users, u => u.age)).toEqual({ fred: 40, pebbles: 1 }); });