BasicOutputBuffer buf = new BasicOutputBuffer();
buf.write( "eliot".getBytes() );
assertEquals( 5 , buf.getPosition() );
assertEquals( 5 , buf.size() );
assertEquals( "eliot" , buf.asString() );
buf.setPosition( 2 );
buf.write( "z".getBytes() );
assertEquals( "elzot" , buf.asString() );