I want to verify that various date fields were updated properly but I don't want to mess around with predicting when new Date() was called. How do I stub out the Date constructor?

import sinon = require('sinon');

import should = require('should');



describe('tests', () => {

  var sandbox;

  var now = new Date();



  beforeEach(() => {

    sandbox = sinon.sandbox.create();

  });



  afterEach(() => {

    sandbox.restore();

  });



  var now = new Date();



  it('sets create_date', done => {

    sandbox.stub(Date).returns(now); // does not work



    Widget.create((err, widget) => {

      should.not.exist(err);

      should.exist(widget);

      widget.create_date.should.eql(now);



      done();

    });

  });

});

In case it is relevant, these tests are running in a node app and we use TypeScript.