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