code: def test_squad_metric(self):
      predictions = [
          {"prediction_text": "1976", "id": "56e10a3be3433e1400422b22"}
      ]
      references = [
          {
              "answers": {"answer_start": [97], "text": ["1976"]},
              "id": "56e10a3be3433e1400422b22",
          }
      ]
      squad_metric = SQuADMetric()
      score = squad_metric(predictions, references)
      self.assertEqual(100.0, score["exact_match"])
      self.assertEqual(100.0, score["f1"])
  
imports: import unittest
  from textflint.input.model.metrics.metrics import *
  import numpy
label_desc: Use image node_id 1 for calling the TestMetrics obj's underlying member method code with example usage: obj.test_squad_metric() without return types