static void print(Schema<?> schema)
    {
        int i = 1;
        for (String name = schema.getFieldName(i); name != null; name = schema
                .getFieldName(++i))
        {
            System.err.println(name);
        }
    }
Test cyclic ser/deser on fields where the type is dynamic.

@author David Yu
@created Oct 20, 2011
protostuff-runtime/src/test/java/io/protostuff/runtime/ObjectSchemaTest.java