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Learning Reactive Programming With Java 8

You're reading from   Learning Reactive Programming With Java 8 Learn how to use RxJava and its reactive Observables to build fast, concurrent, and powerful applications through detailed examples

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Product type Paperback
Published in Jun 2015
Publisher Packt
ISBN-13 9781785288722
Length 182 pages
Edition 1st Edition
Languages
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Author (1):
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Nickolay Tzvetinov Nickolay Tzvetinov
Author Profile Icon Nickolay Tzvetinov
Nickolay Tzvetinov
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Table of Contents (10) Chapters Close

Preface 1. An Introduction to Reactive Programming 2. Using the Functional Constructions of Java 8 FREE CHAPTER 3. Creating and Connecting Observables, Observers, and Subjects 4. Transforming, Filtering, and Accumulating Your Data 5. Combinators, Conditionals, and Error Handling 6. Using Concurrency and Parallelism with Schedulers 7. Testing Your RxJava Application 8. Resource Management and Extending RxJava Index

Using the TestSubscriber class for in-depth testing


The TestSubscriber instance is a special Subscriber instance, which we can pass to the subscribe() method of any Observable instance.

We can retrieve all the received items and notifications from it. We can also look at the last thread on which the notifications have been received and the subscription state.

Let's rewrite our test using it, in order to demonstrate its capabilities and what it stores:

@Test
public void testUsingTestSubscriber() {
  TestSubscriber<String> subscriber =
    new TestSubscriber<String>();
  tested.subscribe(subscriber);
  Assert.assertEquals(expected, subscriber.getOnNextEvents());
  Assert.assertSame(1, subscriber.getOnCompletedEvents().size());
  Assert.assertTrue(subscriber.getOnErrorEvents().isEmpty());
  Assert.assertTrue(subscriber.isUnsubscribed());
}

The test is, again, very simple. We create a TestSubscriber instance and subscribe to the tested Observable instance with it. And we have access...

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