timemachine/test/timemachine.js

Test your time critical app by overriding the native Javascript Date function

describe('check timemachine', function() {

    beforeEach(function() {
        jasmine.clock().install();
    });

    afterEach(function() {
        jasmine.clock().uninstall();
        timemachine.reset();
        timemachine.config({});
    });

    describe('check Date constructor', function() {

        it('should default to Thu, 01 Jan 1970 00:00:00 GMT', function() {
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:00 GMT');
        });

        it('should now be set to December 25, 1991 13:12:59 via dateString', function() {
            timemachine.config({
                dateString: 'Wed, 25 Dec 1991 13:12:59 GMT'
            });
            expect(new Date().toUTCString()).toBe('Wed, 25 Dec 1991 13:12:59 GMT');
        });

        it('should now be set to December 25, 1991 12:12:59 via timestamp', function() {
            timemachine.config({
                timestamp: 693663179000
            });
            expect(new Date().toUTCString()).toBe('Wed, 25 Dec 1991 12:12:59 GMT');
        });

        it('should stay the same for instantiation with millisecond param', function() {
            expect(new Date(1).toUTCString()).toBe('Thu, 01 Jan 1970 00:00:00 GMT');
        });

        it('should stay the same for instantiation with dateString', function() {
            expect(new Date('Wed, 25 Dec 1991 12:12:59 GMT').toUTCString()).toEqual('Wed, 25 Dec 1991 12:12:59 GMT');
        });

        it ('should stay the same for instantiation with year, month, day', function() {
            expect(new Date(1990, 12, 25).toUTCString()).toEqual(new Date.OriginalDate(1990, 12, 25).toUTCString());
        });

        it('should stay the same for instantiation with year, month, day, hours, minutes, seconds, milliseconds', function() {
            expect(new Date(1990, 12, 25, 6, 12, 59, 1).toUTCString()).toEqual(new Date.OriginalDate(1990, 12, 25, 6, 12, 59, 1).toUTCString());
        });

        it('should reset', function() {
            timemachine.reset();
            expect(new Date().toUTCString()).not.toBe('Thu, 01 Jan 1970 00:00:00 GMT');
        });

        it('should add a time difference as milliseconds', function() {
            timemachine.config({
                difference: 10000 // 10 seconds
            });
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:10 GMT');
        });

        it('should not tick by default', function() {
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:00 GMT');
            jasmine.clock().tick(1000);
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:00 GMT');
        });

        it('should tick when enabled', function() {
            timemachine.config({
                tick: true
            });
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:00 GMT');
            sleep(1000);
            expect(new Date().toUTCString()).toBe('Thu, 01 Jan 1970 00:00:01 GMT');
        });

        it ('should set date when tick is enabled', function () {
            timemachine.config({
                dateString: 'Thu, 01 Jan 1970 00:00:00 GMT',
                tick: true
            });
            sleep(1000);
            expect(new Date('Wed, 25 Dec 1991 12:12:59 GMT').toUTCString()).toEqual('Wed, 25 Dec 1991 12:12:59 GMT');
        });

        it('should keep system time', function() {
            timemachine.config({
                keepTime: true
            });
            var now = new Date.OriginalDate().toUTCString();
            expect(new Date().toUTCString()).toBe(now);
        });

    });

    describe('check Date.now()', function() {

        it('should return adjusted timestamp', function() {
            expect(Date.now()).toBe(0);
        });

        it('should reset', function() {
            var now = Date.OriginalDate.now();
            timemachine.reset();
            expect(Date.now()).toBe(now);
        });

        it('should add a time difference as milliseconds', function() {
            timemachine.config({
                difference: 10000 // 10 seconds
            });
            expect(Date.now()).toBe(10000);
        });

        it('should not tick by default', function() {
            expect(Date.now()).toBe(0);
            sleep(1000);
            expect(Date.now()).toBe(0);
        });

        it('should tick when enabled', function() {
            timemachine.config({
                tick: true
            });
            expect(Date.now()).toBe(0);
            sleep(1000);
            expect(Date.now()).toBe(1000);
        });

        it('should keep system time', function() {
            timemachine.config({
                keepTime: true
            });
            var now = Date.OriginalDate.now();
            expect(Date.now()).toBe(now);
        });
    });
});

function sleep(ms) {
    var start = new Date.OriginalDate().getTime(),
        expire = start + ms;
    while (new Date.OriginalDate().getTime() < expire) {}
    return;
}