old_contents: #!/usr/bin/env python
  
  # Copyright (c) 2017 Huawei Technologies Co.,Ltd and others.
  #
  # All rights reserved. This program and the accompanying materials
  # are made available under the terms of the Apache License, Version 2.0
  # which accompanies this distribution, and is available at
  # http://www.apache.org/licenses/LICENSE-2.0
  
  """Refstack testcase implementation."""
  
  import logging
  import os
  import shutil
  import time
  
  from refstack_client import list_parser
  from xtesting.core import testcase
  from xtesting.energy import energy
  
  from functest.opnfv_tests.openstack.tempest import tempest
  from functest.utils import config
  
  
  class Refstack(tempest.TempestCommon):
      """Refstack testcase implementation class."""
  
      __logger = logging.getLogger(__name__)
  
      defcorelist = os.path.join(
          getattr(config.CONF, 'dir_refstack_data'), 'defcore.txt')
  
      def __init__(self, **kwargs):
          if "case_name" not in kwargs:
              kwargs["case_name"] = 'refstack'
          super(Refstack, self).__init__(**kwargs)
          self.res_dir = os.path.join(
              getattr(config.CONF, 'dir_results'), 'refstack')
          self.list = os.path.join(self.res_dir, 'tempest-list.txt')
  
      @energy.enable_recording
      def run(self, **kwargs):
          """Start Refstack testcase."""
          self.start_time = time.time()
          try:
              self.configure()
              parser = list_parser.TestListParser(
                  getattr(config.CONF, 'dir_repo_tempest'))
              nfile = parser.get_normalized_test_list(Refstack.defcorelist)
              shutil.copyfile(nfile, self.list)
              self.run_verifier_tests()
              self.parse_verifier_result()
              self.generate_report()
              res = testcase.TestCase.EX_OK
          except Exception:  # pylint: disable=broad-except
              self.__logger.exception('Error with run')
              res = testcase.TestCase.EX_RUN_ERROR
          finally:
              self.resources.cleanup()
          self.stop_time = time.time()
          return res
  
new_contents: #!/usr/bin/env python
  
  # Copyright (c) 2017 Huawei Technologies Co.,Ltd and others.
  #
  # All rights reserved. This program and the accompanying materials
  # are made available under the terms of the Apache License, Version 2.0
  # which accompanies this distribution, and is available at
  # http://www.apache.org/licenses/LICENSE-2.0
  
  """Refstack testcase implementation."""
  
  import logging
  import os
  import shutil
  
  from refstack_client import list_parser
  
  from functest.opnfv_tests.openstack.tempest import tempest
  from functest.utils import config
  
  
  class Refstack(tempest.TempestCommon):
      """Refstack testcase implementation class."""
  
      __logger = logging.getLogger(__name__)
  
      defcorelist = os.path.join(
          getattr(config.CONF, 'dir_refstack_data'), 'defcore.txt')
  
      def __init__(self, **kwargs):
          if "case_name" not in kwargs:
              kwargs["case_name"] = 'refstack'
          super(Refstack, self).__init__(**kwargs)
          self.res_dir = os.path.join(
              getattr(config.CONF, 'dir_results'), 'refstack')
          self.list = os.path.join(self.res_dir, 'tempest-list.txt')
  
      def generate_test_list(self):
          parser = list_parser.TestListParser(
              getattr(config.CONF, 'dir_repo_tempest'))
          nfile = parser.get_normalized_test_list(Refstack.defcorelist)
          shutil.copyfile(nfile, self.list)
  
      def apply_tempest_blacklist(self):
          pass
  
subject: Refactor refstack to limit instructions