Sinon.js Timer Demo

TImerSpec.js

describe('timer Demo', function () {
    var clock;
    beforeEach(function () {
        clock = sinon.useFakeTimers();
    });
    afterEach(function () {
        clock.restore();
    });
    it('setTimeout', function () {
        var spy = sinon.spy();
        setTimeout(spy, 1000);
        clock.tick(999);
        expect(spy).to.not.be.called;
        clock.tick(1);
        expect(spy).to.be.called;
        clock.tick(1100);
    });
    it("setInterval", function () {
        var spy = sinon.spy();
        setInterval(spy,1000);
        clock.tick(999);
        expect(spy).to.not.be.called;
        clock.tick(1);
        expect(spy).to.be.called;
        clock.tick(5000);
        expect(spy).to.have.callCount(6);
    });
});