Unit Test - Verify Observable is subscribed

Question

I have got the java code like this

 mDataManager.getObservable(\"hello\").subscribe( subscriber );

and I want to verify the follow

Answer 1

I found that RxJava provides a class called TestSubject

You can create it like this

private TestScheduler eventsScheduler = new TestScheduler();
private TestSubject eventObservable = TestSubject.create(eventsScheduler);

This will provide you with the method hasObservers() which returns a boolean.

@Test
public void testSubscription(){
    myTestClass.init(eventObservable);

    assertTrue(eventObservable.hasObservers());
}

Also the TestSubject allows you to perfectly time when events should be sent.

eventObservable.onNext(new MyEvent());
eventsScheduler.triggerActions();