core/src/test/java/org/apache/james/mime4j/io/PositionInputStreamTest.java

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package org.apache.james.mime4j.io;

import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;

public class PositionInputStreamTest {

    @Test
    public void testPositionCounting() throws IOException {
        byte[] data = new byte[]{'0', '1', '2', '3', '4', '5', '6'};
        PositionInputStream countingStream = new PositionInputStream(InputStreams.create(data));
        Assert.assertEquals(0, countingStream.getPosition());
        Assert.assertTrue(countingStream.read() != -1);
        Assert.assertEquals(1, countingStream.getPosition());
        byte[] tmp = new byte[3];
        Assert.assertEquals(3, countingStream.read(tmp));
        Assert.assertEquals(4, countingStream.getPosition());
        Assert.assertEquals(2, countingStream.skip(2));
        Assert.assertEquals(6, countingStream.getPosition());
        Assert.assertTrue(countingStream.read() != -1);
        Assert.assertEquals(7, countingStream.getPosition());
        Assert.assertTrue(countingStream.read() == -1);
        Assert.assertEquals(7, countingStream.getPosition());
        Assert.assertTrue(countingStream.read() == -1);
        Assert.assertEquals(7, countingStream.getPosition());
        Assert.assertTrue(countingStream.read(tmp) == -1);
        Assert.assertEquals(7, countingStream.getPosition());
        Assert.assertTrue(countingStream.read(tmp) == -1);
        Assert.assertEquals(7, countingStream.getPosition());
        countingStream.close();
    }

}