TestReactiveDataProducer.java

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 * to you under the Apache License, Version 2.0 (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.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

import io.reactivex.rxjava3.core.Flowable;

class TestReactiveDataProducer {
    @Test
    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);

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

        producer.produce(streamChannel);

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

    @Test
    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);
        Assertions.assertEquals("12345", byteChannel.dump(StandardCharsets.US_ASCII));

        final HttpStreamResetException exception = Assertions.assertThrows(HttpStreamResetException.class, () ->
                producer.produce(streamChannel));
        Assertions.assertTrue(exception.getCause() instanceof RuntimeException, "Expected published exception to be rethrown");
        Assertions.assertEquals("", byteChannel.dump(StandardCharsets.US_ASCII));
    }
}