BehaviorSubjectExample.java

/*******************************************************************************
 * Copyright (c) 2015 Christos Froussios
 *
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 * of this software and associated documentation files (the "Software"), to deal
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package itrx.chapter1;

import java.util.Arrays;

import org.junit.Test;

import rx.observers.TestSubscriber;
import rx.subjects.BehaviorSubject;

public class BehaviorSubjectExample {

	public void exampleLate() {
		BehaviorSubject<Integer> s = BehaviorSubject.create();
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.subscribe(v -> System.out.println("Late: " + v)); 
		s.onNext(3);
		
		// Late: 2
		// Late: 3
	}
	
	public void exampleCompleted() {
		BehaviorSubject<Integer> s = BehaviorSubject.create();
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.onCompleted();
		s.subscribe(
		    v -> System.out.println("Late: " + v),
		    e -> System.out.println("Error"),
		    () -> System.out.println("Completed")
		);
	}
	
	public void exampleInitialvalue() {
		BehaviorSubject<Integer> s = BehaviorSubject.create(0);
		s.subscribe(v -> System.out.println(v));
		s.onNext(1);
		
		// 0
		// 1
	}
	
	
	//
	// Tests
	//
	
	@Test
	public void testLate() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		
		BehaviorSubject<Integer> s = BehaviorSubject.create();
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.subscribe(tester); 
		s.onNext(3);
		
		tester.assertReceivedOnNext(Arrays.asList(2,3));
	}
	
	@Test
	public void testCompleted() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		
		BehaviorSubject<Integer> s = BehaviorSubject.create();
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.onCompleted();
		s.subscribe(tester);
		
		tester.assertReceivedOnNext(Arrays.asList());
		tester.assertTerminalEvent();
		tester.assertNoErrors();
	}
	
	@Test
	public void testInitialvalue() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		
		BehaviorSubject<Integer> s = BehaviorSubject.create(0);
		s.subscribe(tester);
		s.onNext(1);
		
		tester.assertReceivedOnNext(Arrays.asList(0,1));
		tester.assertNoErrors();
	}

}