Ava, Sinon, Moment testing time date

testTime.js

// I was testing some functionality that relied on `moment()`. 
// I wanted to fake the value of the time Moment uses so I could test return values. 
// Here is the method I used. Reference: https://stackoverflow.com/a/31591297/1478950

const test = require("ava");
const sinon = require("sinon");
const moment = require("moment");

let sandbox;

test.before(t => {
  sandbox = sinon.sandbox.create();
});

test.afterEach.always(t => {
  sandbox.restore();
});

test("should return mocked time", t => {
  let testTime = "2017-07-04T00:00:00.000Z";
  sinon.useFakeTimers(new Date(testTime).getTime());
  t.is(moment().toISOString(), testTime);
});