const expect = require('expect'); const getDaysDiffBetweenDates = require('./getDaysDiffBetweenDates.js'); test('Testing getDaysDiffBetweenDates', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof getDaysDiffBetweenDates === 'function').toBeTruthy(); expect(getDaysDiffBetweenDates(new Date('2017-12-13'), new Date('2017-12-22'))).toBe(9); });