code: def test_repr(self):
      metric = Metric("train_acc", dtype=float, lower_is_better=False)
      self.assertEqual(
          "Metric('train_acc', dtype=float, lower_is_better=False)",
          repr(metric),
      )
  
imports: import unittest
  from small_text.training.metrics import Metric
label_desc: Use image node_id 1 for calling the MetricsTest obj's underlying member method code with example usage: obj.test_repr() without return types