code: def test_default_roc(self):
      mlist = MetricList(["roc_auc"])
      self.assertTrue(mlist.metric_list[0].name == "roc_auc_score")
  
      mlist = MetricList(["roc_auc_score"])
      self.assertTrue(mlist.metric_list[0].name == "roc_auc_score")
  
file_path: torchbearer/tests/metrics/test_roc_auc_score.py
imports: import unittest
  from mock import Mock, patch
  import torchbearer
  from torchbearer.metrics import RocAucScore, MetricList
  import torch
  import numpy
label_desc: Use image node_id 4 for calling the TestRocAucScore obj's underlying member method code with example usage: obj.test_default_roc() without return types