old_contents: import os
  import shutil
  from .datasets import Dataset
  from mclearn.experiment import ActiveExperiment
  
  class TestExperiment:
      @classmethod
      def setup_class(cls):
          cls.data = Dataset('wine')
          cls.policies = ['passive', 'margin', 'weighted-margin', 'confidence',
                          'weighted-confidence', 'entropy', 'weighted-entropy',
                          'qbb-margin', 'qbb-kl', 'thompson', 'ocucb', 'klucb',
                          'exp++', 'borda', 'geometric', 'schulze']
  
      def test_experiment(self):
          for policy in self.policies:
              expt = ActiveExperiment(self.data.features, self.data.target,
                                      'wine', policy, n_iter=1)
              expt.run()
  
      @classmethod
      def teardown_class(cls):
          if os.path.exists('results'):
              shutil.rmtree('results')
  
new_contents: import os
  import shutil
  from .datasets import Dataset
  from mclearn.experiment import ActiveExperiment
  
  class TestExperiment:
      @classmethod
      def setup_class(cls):
          cls.data = Dataset('wine')
          cls.policies = ['passive', 'margin', 'weighted-margin', 'confidence',
                          'weighted-confidence', 'entropy', 'weighted-entropy',
                          'qbb-margin', 'qbb-kl', 'thompson', 'ocucb', 'klucb',
                          'exp++', 'borda', 'geometric', 'schulze']
  
      def test_experiment(self):
          for policy in self.policies:
              expt = ActiveExperiment(self.data.features, self.data.target,
                                      'wine', policy, n_iter=1)
              expt.run_policies()
  
      @classmethod
      def teardown_class(cls):
          if os.path.exists('results'):
              shutil.rmtree('results')
  
subject: Fix typo in test