Changes to ensure consistent MD5 value

import static org.junit.Assert.assertEquals;

import java.nio.charset.Charset;

import java.security.MessageDigest;

import org.junit.Before;

import org.junit.Test;

        String contentEncoding = "gzip";

        Long contentLength = 256L;

        String contentType = "text/xml";

        String md5Sum = new String(new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16});

        String md5SumSource = "valuetohashis a longer string now.";

        MessageDigest md = MessageDigest.getInstance("MD5");

        md.reset();

        md.update(md5SumSource.getBytes("iso-8859-1"), 0, md5SumSource.length());

        byte[] md5hash = md.digest();

        String contentMD5 = new String(md5hash, Charset.forName("iso-8859-1"));

        FileMetadata metadata1 = new FileMetadata();

        metadata1.setContentEncoding(contentEncoding);

        metadata1.setContentLength(contentLength);

        metadata1.setContentType(contentType);

        metadata1.setMd5Sum(md5Sum);

        metadata1.setMd5Sum(contentMD5);

        vospaceFileMetadataSource.set(testURI.getURIObject(), metadata1);

        FileMetadata metadata2 = vospaceFileMetadataSource.get(testURI.getURIObject());

        assertEquals(contentEncoding, metadata2.getContentEncoding());

        assertEquals(contentLength, metadata2.getContentLength());

        assertEquals(contentType, metadata2.getContentType());

        assertEquals(md5Sum, metadata2.getMd5Sum());

        assertEquals(contentMD5, metadata2.getMd5Sum());

    }