Examples with TestScheduler rx.schedulers.TestScheduler used on opensource projects

Example 11 with TestScheduler

use of rx.schedulers.TestScheduler in project AnDevCon-RxPatterns by colintheshots.

the class Example16Test method using_testscheduler_to_simulate_network_events.

@Test
public void using_testscheduler_to_simulate_network_events() {
    // TestScheduler lets you advance time by hand
    TestScheduler scheduler = Schedulers.test();
    TestSubscriber<NetworkResponse> subscriber = new TestSubscriber<>();
    // Scheduler.Worker lets you schedule events in time
    Scheduler.Worker worker = scheduler.createWorker();
    // Subjects allow both input and output, so they can be swapped in for
    // Retrofit calls to unit test your code.
    final PublishSubject<NetworkResponse> networkSubject = PublishSubject.create();
    // schedule a first observable event to occur at 1000 ms
    worker.schedule(new Action0() {

        @Override
        public void call() {
            // explicitly calling onNext in a worker allows one to
            // create a very specific test of timed events
            networkSubject.onNext(new NetworkResponse(401));
        }
    }, 1000, TimeUnit.MILLISECONDS);
    // schedule a second observable event to occur at 2000 ms
    worker.schedule(new Action0() {

        @Override
        public void call() {
            networkSubject.onNext(new NetworkResponse(200));
            networkSubject.onCompleted();
        }
    }, 2000, TimeUnit.MILLISECONDS);
    // we must subscribe before anticipating results
    networkSubject.subscribeOn(scheduler).subscribe(subscriber);
    // we can manually advance time using the scheduler and check assertions
    scheduler.advanceTimeBy(1500, TimeUnit.MILLISECONDS);
    subscriber.assertReceivedOnNext(Arrays.asList(new NetworkResponse(401)));
    // awaitTerminalEvent will wait forever if we don't advance time enough
    scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
    subscriber.awaitTerminalEvent();
    subscriber.assertReceivedOnNext(Arrays.asList(new NetworkResponse(401), new NetworkResponse(200)));
    // TestSubscriber provides many useful methods
    subscriber.assertNoErrors();
    subscriber.assertValueCount(2);
    subscriber.assertUnsubscribed();
}