IsEmptyExample.java

/*******************************************************************************
 * Copyright (c) 2015 Christos Froussios
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * SOFTWARE.
 *
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package itrx.chapter2.inspection;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

import org.junit.Test;

import rx.Observable;
import rx.Subscription;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
import rx.schedulers.TestScheduler;

public class IsEmptyExample {

	public void exampleIsEmpty() {
		Observable<Long> values = Observable.timer(1000, TimeUnit.MILLISECONDS);

		Subscription subscription = values
		    .isEmpty()
		    .subscribe(
		        v -> System.out.println(v),
		        e -> System.out.println("Error: " + e),
		        () -> System.out.println("Completed")
		    );
		
		subscription.unsubscribe();
		
		// false
		// Completed
	}
	
	
	//
	// Test
	//
	
	@Test
	public void testIsEmpty() {
		TestSubscriber<Boolean> tester = new TestSubscriber<Boolean>();
		TestScheduler scheduler = Schedulers.test();
		
		Observable<Long> values = Observable.timer(1000, TimeUnit.MILLISECONDS, scheduler);

		Subscription subscription = values
		    .isEmpty()
		    .subscribe(tester);
		
		scheduler.advanceTimeBy(1000, TimeUnit.MILLISECONDS);
		subscription.unsubscribe();

		tester.assertReceivedOnNext(Arrays.asList(false));
		tester.assertTerminalEvent();
		tester.assertNoErrors();
	}

}