java - Junit の実行中に例外 ArrayOutOfBound が発生する

Question

以下の方法のJunitを書いています

誰かがこれに対する適切な解決策を提案できますか

Junitを実行した後、私は例外を下回っています

java.lang.ArrayIndexOutOfBoundsException: -84
    at org.apache.commons.codec.binary.Base64.isBase64(Base64.java:137)
    at org.apache.commons.codec.binary.Base64.isArrayByteBase64(Base64.java:163)

私のテストクラス

public class DecodeToObjectTest extends TestCase {


    public void testDecode() {
        try {
            String data="data";
              ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(baos);

                oos.writeObject(data);       
            // convert String into InputStream
             DecodeToObject.decode(new String(baos.toByteArray()));


        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

私がテストする必要がある方法

public static
    Object decode(
            String input ) throws IOException,
                                  ClassNotFoundException
    {
        Log log = LogFactory.getFactory().getInstance(
                        "com.avocent.cps.report.service" );

        try
        {
            boolean c = Base64.isArrayByteBase64( input.getBytes() );

          if(log.isDebugEnabled()){
            log.debug( "DecodeToObject :Entering Helper  Input: " + input );          }

            byte[] data = Base64.decodeBase64( input.getBytes() );

            ObjectInputStream ois = new ObjectInputStream(
                                        new ByteArrayInputStream( data ) );

          if(log.isDebugEnabled()){
            log.debug( "DecodeToObject :Object Input stream ois: " + ois );          }

            Object obj = null;

            obj = ois.readObject();


          if(log.isDebugEnabled()){
            log.debug(
                "DecodeToObject :Convering object to String: "
                + obj.toString() );
          }
            ois.close();

              if(log.isDebugEnabled()){
                        log.debug(
               "DecodeToObject :Decoded byte array to object successfully " );
               }

            return obj;
        }
        catch( ClassNotFoundException cnfe )
        {
                if(log.isErrorEnabled()){

            log.error( "DecodeToObject : Error :" );

                    }

            throw cnfe;
        }
        catch( IOException ioe )
        {

          if(log.isErrorEnabled()){
            log.error( "DecodeToObject : Error :" ); 

          }

            throw ioe;
        }
    }