BufferingSubscriberErrorCompleteTest.java

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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Flow.Subscription;
import java.util.concurrent.Phaser;
import java.util.concurrent.SubmissionPublisher;
import java.util.stream.IntStream;
import java.net.http.HttpResponse.BodySubscriber;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.Long.MAX_VALUE;
import static java.lang.Long.MIN_VALUE;
import static java.nio.ByteBuffer.wrap;
import static java.net.http.HttpResponse.BodySubscribers.buffering;
import static org.testng.Assert.*;

/*
 * @test
 * @summary Test for HttpResponse.BodySubscriber.buffering() onError/onComplete
 * @run testng/othervm BufferingSubscriberErrorCompleteTest
 */

public class BufferingSubscriberErrorCompleteTest {

    @DataProvider(name = "illegalDemand")
    public Object[][] illegalDemand() {
        return new Object[][]{
            {0L}, {-1L}, {-5L}, {-100L}, {-101L}, {-100_001L}, {MIN_VALUE}
        };
    }

    @Test(dataProvider = "illegalDemand")
    public void illegalRequest(long demand) throws Exception {
        ExecutorService executor = Executors.newFixedThreadPool(1);
        SubmissionPublisher<List<ByteBuffer>> publisher =
                new SubmissionPublisher<>(executor, 1);

        Phaser gate = new Phaser(2);  // single onSubscribe and onError
        ExposingSubscriber exposingSubscriber = new ExposingSubscriber(gate);
        BodySubscriber subscriber = buffering(exposingSubscriber, 1);
        publisher.subscribe(subscriber);
        gate.arriveAndAwaitAdvance();

        Subscription s = exposingSubscriber.subscription;