const convertDateToISOString = require('../util/convertDateToISOString'); let dates = [new Date("2020-01-01"), new Date(0), new Date(5600000), new Date(1000200000000)] let expectedDateStrings = ["2020-01-01 00:00:00", "1970-01-01 00:00:00", "1970-01-01 01:33:20", "2001-09-11 09:20:00"] for (let i = 0; i < dates.length; i++) { test('Converts to human readable date string', () => { expect(convertDateToISOString(dates[i])).toBe(expectedDateStrings[i]); }); }