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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * 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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/*

 * @test 8167461

 * @summary Verify PipeInputStream works.

 * @modules jdk.compiler/com.sun.tools.javac.util

 *          jdk.jshell/jdk.jshell.execution:open

 * @run testng PipeInputStreamTest

 */

import java.io.InputStream;

import java.io.OutputStream;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import org.testng.annotations.Test;

import com.sun.tools.javac.util.Pair;

import static org.testng.Assert.*;

@Test

public class PipeInputStreamTest {

    public void testReadArrayNotBlocking() throws Exception {

        Pair<InputStream, OutputStream> streams = createPipeStream();

        InputStream in = streams.fst;

        OutputStream out = streams.snd;

        out.write('a');

        byte[] data = new byte[12];

        assertEquals(in.read(data), 1);

        assertEquals(data[0], 'a');

        out.write('a'); out.write('b'); out.write('c');

        assertEquals(in.read(data), 3);

        assertEquals(data[0], 'a');

        assertEquals(data[1], 'b');

        assertEquals(data[2], 'c');

    }

    private Pair<InputStream, OutputStream> createPipeStream() throws Exception {

        Class<?> pipeStreamClass = Class.forName("jdk.jshell.execution.PipeInputStream");

        Constructor<?> c = pipeStreamClass.getDeclaredConstructor();

        c.setAccessible(true);

        Object pipeStream = c.newInstance();

        Method createOutputStream = pipeStreamClass.getDeclaredMethod("createOutput");

        createOutputStream.setAccessible(true);

        return Pair.of((InputStream) pipeStream, (OutputStream) createOutputStream.invoke(pipeStream));

    }

}