code: def test_api(self):
      response = self.client.get("/api/config/")
      data = json.loads(response.get_data())
  
      assert data["className"] == ""
  
      items = data["config"]["items"]
  
      assert items[0] == {
          "name": "dataset_reader",
          "configurable": True,
          "comment": "specify your dataset reader here",
          "annotation": {
              "origin": "allennlp.data.dataset_readers.dataset_reader.DatasetReader"
          },
      }
  
imports: from __future__ import with_statement
  from __future__ import division
  from __future__ import absolute_import
  from __future__ import print_function
  import json
  import os
  import pathlib
  import sys
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.service import config_explorer
  from allennlp.service.config_explorer import make_app, _HTML
  from io import open
label_desc: Use image node_id 4 for calling the TestConfigExplorer obj's underlying member method code with example usage: obj.test_api() without return types