TestByteField.java

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   contributor license agreements.  See the NOTICE file 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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.util;

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

import junit.framework.TestCase;

/**
 * Title:        Unit test for ByteField class
 * Description:  Unit test for ByteField class
 * @author       Marc Johnson (mjohnson at apache dot org)
 */
public final class TestByteField extends TestCase {

    private static final byte[] _test_array =
    {
        Byte.MIN_VALUE, ( byte ) -1, ( byte ) 0, ( byte ) 1, Byte.MAX_VALUE
    };

    public void testConstructors() {
        try
        {
            new ByteField(-1);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        ByteField field = new ByteField(2);

        assertEquals(( byte ) 0, field.get());
        try
        {
            new ByteField(-1, ( byte ) 1);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new ByteField(2, ( byte ) 3);
        assertEquals(( byte ) 3, field.get());
        byte[] array = new byte[ 3 ];

        try
        {
            new ByteField(-1, ( byte ) 1, array);
            fail("Should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new ByteField(2, ( byte ) 4, array);
        assertEquals(( byte ) 4, field.get());
        assertEquals(( byte ) 4, array[ 2 ]);
        array = new byte[ 2 ];
        try
        {
            new ByteField(2, ( byte ) 5, array);
            fail("should have gotten ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        for (byte b : _test_array) {
            array = new byte[ 1 ];
            new ByteField(0, b, array);
            assertEquals(b, new ByteField(0, array).get());
        }
    }

    public void testSet() {
        ByteField field = new ByteField(0);
        byte[]    array = new byte[ 1 ];

        for (int j = 0; j < _test_array.length; j++)
        {
            field.set(_test_array[ j ]);
            assertEquals("testing _1 " + j, _test_array[ j ], field.get());
            field = new ByteField(0);
            field.set(_test_array[ j ], array);
            assertEquals("testing _2 ", _test_array[ j ], field.get());
            assertEquals("testing _3 ", _test_array[ j ], array[ 0 ]);
        }
    }

    public void testReadFromBytes() {
        ByteField field = new ByteField(1);
        byte[]    array = new byte[ 1 ];

        try
        {
            field.readFromBytes(array);
            fail("should have caught ArrayIndexOutOfBoundsException");
        }
        catch (ArrayIndexOutOfBoundsException ignored_e)
        {

            // as expected
        }
        field = new ByteField(0);
        for (int j = 0; j < _test_array.length; j++)
        {
            array[ 0 ] = _test_array[ j ];
            field.readFromBytes(array);
            assertEquals("testing " + j, _test_array[ j ], field.get());
        }
    }

    public void testReadFromStream() throws IOException {
        ByteField field  = new ByteField(0);
        byte[]    buffer = new byte[ _test_array.length ];

        System.arraycopy(_test_array, 0, buffer, 0, buffer.length);
        ByteArrayInputStream stream = new ByteArrayInputStream(buffer);

        for (int j = 0; j < buffer.length; j++)
        {
            field.readFromStream(stream);
            assertEquals("Testing " + j, _test_array[ j ], field.get());
        }
    }

    public void testWriteToBytes() {
        ByteField field = new ByteField(0);
        byte[]    array = new byte[ 1 ];

        for (byte b : _test_array) {
            field.set(b);
            field.writeToBytes(array);
            assertEquals("testing ", b, array[ 0 ]);
        }
    }
}