code: def test_same_bleu(self):
      ref = "this is a string"
      self.assertDictClose(
          metrics.bleu([ref, ref], [ref, ref]), {"bleu": 100}
      )
  
imports: from unittest import mock
  from absl.testing import absltest
  import numpy
  import seqio
  import sklearn.metrics
  from t5.evaluation import metrics
  from t5.evaluation import test_utils
label_desc: Use image node_id 1 for calling the MetricsTest obj's underlying member method code with example usage: obj.test_same_bleu() without return types