How to easily test redux-observable epic that emits an action after 5 minutes? - testing

Question

I have an epic that emits SOME_OTHER_ACTION when 5 minutes have passed after SOME_ACTION (using delay operator).
I want to use jest or sinon useFakeTimers method to be able to do the following: dispatch an action, wait 5 minutes and test if another action was dispatched.
I really don't want to use marble diagrams, or inject TestSchedulers.
I also don't want to wait 5 minutes of real time.
const timeBefore = new Date().getTime() / 1000;
store.dispatch(SOME_ACTION);
// wait 5 minutes
jest.runTimersToTime(5 * 60 * 1000);
expect(store.getActions()).toEqual([ SOME_ACTION, SOME_OTHER_ACTION ]);
expect(store.getActions()[1].time).toEqual(timeBefore + 5 * 60 * 1000);

Answer 1

So what I ended up doing is: replaced RxJS with xstream, and used adapter for redux-observable, modified my epics accordingly.
It turns out that Jest doesn't handle Date correctly when using fakeTimers, so I used lolex for fake timers.
See my gist for full example.
(I didn't find easy way to test or replace internal RxJS delay, so I had to use different reactive library).
clock.setTimeout(() => {
expect(store.getActions()).toEqual([trainIncomingAction, reminderAction]);
done();
}, 60 * 60 * 1001);
clock.runToLast();