code: def testJson_getsAutoSerialized(self):
      q = wrappers.Request(wtest.EnvironBuilder().get_environ())
      r = http_util.Respond(q, [1, 2, 3], "application/json")
      self.assertEqual(r.response, [b"[1, 2, 3]"])
  
imports: import gzip
  import io
  import struct
  from unittest import mock
  from werkzeug import test
  from werkzeug import wrappers
  from tensorboard import test
  from tensorboard.backend import http_util
label_desc: Use image node_id 10 for calling the RespondTest obj's underlying member method code with example usage: obj.testJson_getsAutoSerialized() without return types