Using marble testing rxjs5 method inside another project

I have a webapp project which uses rxjs5 to implement a flux and I am currently looking for solutions to write unit tests on it.

In fact, I have implemented custom observables inside, for example :

function getActivityObservable(events, timeout) {
  return Observable.create((observer) => {
    const deb = debounce(() => observer.next(false), timeout || DEFAULT_TIMEOUT);
    const sub = events.subscribe((e) => {
      if (!e) {
        deb.cancel();
        observer.next(false);
      } else {
        observer.next(true);
        deb(e);
      }
    });

    return () => {
      if (sub) sub.unsubscribe();
      if (deb) deb.cancel();
    };
  }).distinctUntilChanged();
}

I would like to test it using the marble testing way and write something like (i took a sample example from rxjs repository)

  describe("getActivityObservable", () => {
    it("should debounce by selector observable", () => {
      const e1 =   hot("--a--bc--d----|");
      const e1subs =   "^             !";
      const expected = "----a---c--d--|";

      expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
      expectSubscriptions(e1.subscriptions).toBe(e1subs);
    });
  });

My question is:

Is it possible to use marble testing method (with operators like hot, cold and so on...) outside the rxjs5 project. I don't figure out how to use this nice tool in my project.

Thank you for your help.