time-enforcer/tests/freeze.test.js

A JavaScript implementation of the Ruby Timecop gem https://github.com/travisjeffery/timecop.

/* globals describe, it, afterEach */
var TimeEnforcer = require('../index.js'),
    expect = require('expect.js');
    //originalDate = new Date();


describe('TimeEnforcer', function() {
  afterEach(function() {
    TimeEnforcer.restore();
  });

  describe('.freeze', function() {
    it('should stop time indefinitely', function(done) {
      TimeEnforcer.freeze(2011, 3, 4, 1, 2, 0, 0);
      var start = new Date();
      expect(start.getTime()).to.be(1301904120000);
      setTimeout(function() {
        var future = new Date();
        expect(future.getTime()).to.be(1301904120000);
        setTimeout(function() {
          var farFuture = new Date();
          expect(farFuture.getTime()).to.be(1301904120000);
          done();
        }, 500);
      }, 1000);
      TimeEnforcer.restore(); // unfreeze time in order to allow the timers to increment
    });

    it('should not freeze time outside of the scope function', function(done) {
      TimeEnforcer.freeze(2011, 3, 4, 1, 2, 0, 0, function() {
        var start = new Date();
        expect(start.getTime()).to.be(1301904120000);
        setTimeout(function() {
          var future = new Date();
          expect(future.getTime()).to.be(1301904120000);
          setTimeout(function() {
            var farFuture = new Date();
            expect(farFuture.getTime()).to.be(1301904120000);
            done();
          }, 500);
        }, 1000);
      });
    });

    it('should set the current date to the date passed', function() {
      TimeEnforcer.freeze(2011, 8, 5, 3, 24, 35, 100);
      var current = new Date();
      expect(current.getTime()).to.be(1315218275100);
      expect(current.valueOf()).to.be(1315218275100);
      expect(current.getFullYear()).to.be(2011);
      expect(current.getMonth()).to.be(8);
      expect(current.getDate()).to.be(5);
      expect(current.getHours()).to.be(3);
      expect(current.getMinutes()).to.be(24);
      expect(current.getSeconds()).to.be(35);
      expect(current.getMilliseconds()).to.be(100);
      expect(current.getDay()).to.be(1);
      //expect(current.toDateString()).to.be('Mon Sep 05 2011'); // needs language support
      expect(current.toISOString()).to.match(/^2011-09-05T10:24:35.100Z$/);
      expect(current.toJSON()).to.match(/^2011-09-05T10:24:35.100Z$/);
      //expect(current.toString()).to.match(/^Mon Sep 05 2011 03:24:35 GMT-\d{4} \(.*\)$/); // needs language support
      expect(current.toTimeString()).to.match(/^03:24:35 GMT(\+|\-)\d{4} \(.*\)$/);
    });

    it('should modify Date.now', function() {
      TimeEnforcer.freeze(2011, 7, 4);
      expect(Date.now()).to.be.within(1312441200000, 1312441201000);
    });

    it('should not modify Date.UTC', function() {
      TimeEnforcer.freeze(2011, 7, 24);
      expect(Date.UTC(2013, 5, 21, 2, 34)).to.be(1371782040000);
    });

    it('should not modify Date.parse', function() {
      TimeEnforcer.freeze(2011, 7, 24);
      expect(Date.parse('2013-06-21T02:34:00.100Z')).to.be(1371782040100);
    });

    it('should restore the date once outside of the scope', function() {
      var startDate = new Date(), endDate, called = false;

      TimeEnforcer.freeze(2010, 6, 24, function() {
        called = true;
        var date = new Date();
        expect(date.getFullYear()).to.be(2010);
      });

      endDate = new Date();
      expect(endDate.getDate()).to.be(startDate.getDate());
      expect(called).to.be(true);
    });
  });
});