code: def test_json_dataset_one_key_multiple_fields(self):
      self.write_test_ppid_dataset(data_format="json")
  
      question_field = data.Field(sequential=True)
      spacy_tok_question_field = data.Field(
          sequential=True, tokenize="spacy"
      )
      label_field = data.Field(sequential=False)
      fields = {
          "question1": [
              ("q1", question_field),
              ("q1_spacy", spacy_tok_question_field),
          ],
          "question2": [
              ("q2", question_field),
              ("q2_spacy", spacy_tok_question_field),
          ],
          "label": ("label", label_field),
      }
      dataset = data.TabularDataset(
          path=self.test_ppid_dataset_path, format="json", fields=fields
      )
      expected_examples = [
          (
              ["When", "do", "you", "use", "シ", "instead", "of", "し?"],
              [
                  "When",
                  "do",
                  "you",
                  "use",
                  "シ",
                  "instead",
                  "of",
                  "し",
                  "?",
              ],
              [
                  "When",
                  "do",
                  "you",
                  "use",
                  '"&"',
                  "instead",
                  "of",
                  '"and"?',
              ],
              [
                  "When",
                  "do",
                  "you",
                  "use",
                  '"',
                  "&",
                  '"',
                  "instead",
                  "of",
                  '"',
                  "and",
                  '"',
                  "?",
              ],
              "0",
          ),
          (
              ["Where", "was", "Lincoln", "born?"],
              ["Where", "was", "Lincoln", "born", "?"],
              [
                  "Which",
                  "location",
                  "was",
                  "Abraham",
                  "Lincoln",
                  "born?",
              ],
              [
                  "Which",
                  "location",
                  "was",
                  "Abraham",
                  "Lincoln",
                  "born",
                  "?",
              ],
              "1",
          ),
          (
              ["What", "is", "2+2"],
              ["What", "is", "2", "+", "2"],
              ["2+2=?"],
              ["2", "+", "2=", "?"],
              "1",
          ),
      ]
      for i, example in enumerate(dataset):
          self.assertEqual(example.q1, expected_examples[i][0])
          self.assertEqual(example.q1_spacy, expected_examples[i][1])
          self.assertEqual(example.q2, expected_examples[i][2])
          self.assertEqual(example.q2_spacy, expected_examples[i][3])
          self.assertEqual(example.label, expected_examples[i][4])
  
file_path: decanlp/text/test/data/test_dataset.py
imports: from __future__ import unicode_literals
  import torchtext.data
  from ..common.torchtext_test_case import TorchtextTestCase
label_desc: Use image node_id 2 for calling the TestDataset obj's underlying member method code with example usage: obj.test_json_dataset_one_key_multiple_fields() without return types