httpcore5-reactive/src/test/java/org/apache/hc/core5/reactive/TestReactiveDataProducer.java

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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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 * KIND, either express or implied.  See the License for the
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package org.apache.hc.core5.reactive;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

import org.apache.hc.core5.http.HttpStreamResetException;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.junit.Assert;
import org.junit.Test;

import io.reactivex.Flowable;

public class TestReactiveDataProducer {
    @Test
    public void testStreamThatEndsNormally() throws Exception {
        final Flowable<ByteBuffer> publisher = Flowable.just(
            ByteBuffer.wrap(new byte[]{ '1', '2', '3' }),
            ByteBuffer.wrap(new byte[]{ '4', '5', '6' }));
        final ReactiveDataProducer producer = new ReactiveDataProducer(publisher);

        final WritableByteChannelMock byteChannel = new WritableByteChannelMock(1024);
        final DataStreamChannel streamChannel = new BasicDataStreamChannel(byteChannel);

        producer.produce(streamChannel);

        Assert.assertTrue(byteChannel.isOpen());
        Assert.assertEquals("123456", byteChannel.dump(StandardCharsets.US_ASCII));

        producer.produce(streamChannel);

        Assert.assertFalse(byteChannel.isOpen());
        Assert.assertEquals("", byteChannel.dump(StandardCharsets.US_ASCII));
    }

    @Test
    public void testStreamThatEndsWithError() throws Exception {
        final Flowable<ByteBuffer> publisher = Flowable.concatArray(
            Flowable.just(
                ByteBuffer.wrap(new byte[]{ '1' }),
                ByteBuffer.wrap(new byte[]{ '2' }),
                ByteBuffer.wrap(new byte[]{ '3' }),
                ByteBuffer.wrap(new byte[]{ '4' }),
                ByteBuffer.wrap(new byte[]{ '5' }),
                ByteBuffer.wrap(new byte[]{ '6' })),
            Flowable.error(new RuntimeException())
        );
        final ReactiveDataProducer producer = new ReactiveDataProducer(publisher);

        final WritableByteChannelMock byteChannel = new WritableByteChannelMock(1024);
        final DataStreamChannel streamChannel = new BasicDataStreamChannel(byteChannel);

        producer.produce(streamChannel);
        Assert.assertEquals("12345", byteChannel.dump(StandardCharsets.US_ASCII));

        try {
            producer.produce(streamChannel);
            Assert.fail("Expected ProtocolException");
        } catch (final HttpStreamResetException ex) {
            Assert.assertTrue("Expected published exception to be rethrown", ex.getCause() instanceof RuntimeException);
            Assert.assertEquals("", byteChannel.dump(StandardCharsets.US_ASCII));
        }
    }
}