node_modules/jasmine-node/spec/TimerSpec.js

describe("Manually ticking the Jasmine Mock Clock", function() {
  var timerCallback;

  beforeEach(function() {
    timerCallback = jasmine.createSpy('timerCallback');
    jasmine.Clock.useMock();
  });

  it("causes a timeout to be called synchronously", function() {
    setTimeout(timerCallback, 100);

    expect(timerCallback).not.toHaveBeenCalled();

    jasmine.Clock.tick(101);

    expect(timerCallback).toHaveBeenCalled();
  });

  it("causes an interval to be called synchronously", function() {
    setInterval(timerCallback, 100);

    expect(timerCallback).not.toHaveBeenCalled();

    jasmine.Clock.tick(102);
    expect(timerCallback).toHaveBeenCalled();
    expect(timerCallback.callCount).toEqual(1);

    jasmine.Clock.tick(50);
    expect(timerCallback.callCount).toEqual(1);

    jasmine.Clock.tick(50);
    expect(timerCallback.callCount).toEqual(2);
  });
});