public static <T> void mergeFrom(InputStream in, T message, Schema<T> schema)
            throws IOException
    {
        GraphIOUtil.mergeFrom(in, message, schema);
    }
Test ser/deser of graph objects (references and cyclic dependencies).

@author David Yu
@created Dec 10, 2010
protostuff-core/src/test/java/io/protostuff/GraphTest.java