code: def test_defaults(self):
      class Example(Record):
          a = Integer(default=5)
          b = Integer()
          c = String(default="hello")
  
      r = Example()
      self.assertEqual(r.a, 5)
      self.assertEqual(r.b, None)
      self.assertEqual(r.c, "hello")
  
imports: import math
  import logging
  import requests
  from typing import List
  from unittest import TestCase, main
  import fastavro
  import pulsar
  from pulsar.schema import *
  from enum import Enum
  import json
  from fastavro.schema import load_schema
label_desc: Use image node_id 15 for calling the SchemaTest obj's underlying member method code with example usage: obj.test_defaults() without return types