const expect = require('expect'); const toDecimalMark = require('./toDecimalMark.js'); test('Testing toDecimalMark', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof toDecimalMark === 'function').toBeTruthy(); expect(toDecimalMark(12305030388.9087)).toBe("12,305,030,388.909"); });