PositionInputStreamTest.java

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package org.apache.james.mime4j.io;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import junit.framework.TestCase;

public class PositionInputStreamTest extends TestCase {

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