old_contents: # coding: utf-8
  from __future__ import unicode_literals, print_function
  import os
  import pytest
  
  from codecs import open
  from contextlib import contextmanager
  
  from requests import Response
  
  
  def make_requests_get_mock(filename):
      def mockreturn(*args, **kwargs):
          response = Response()
          with open(os.path.join(os.path.dirname(__file__), 'assets', filename), 'r', 'utf-8') as fd:
              response._content = fd.read().encode('utf-8')
          return response
      return mockreturn
  
  
  def make_simple_text_mock(filename):
      def mockreturn(*args, **kwargs):
          with open(os.path.join(os.path.dirname(__file__), 'assets', filename), 'r', 'utf-8') as fd:
              return fd.read()
      return mockreturn
  
  
  @contextmanager
  def assert_raises(exception_class, msg=None):
      """Check that an exception is raised and its message contains `msg`."""
      with pytest.raises(exception_class) as exception:
          yield
      if msg is not None:
          message = '%s' % exception
          assert msg.lower() in message.lower()
  
new_contents: # coding: utf-8
  
  # Python modules
  from __future__ import unicode_literals, print_function
  import os
  from codecs import open
  from contextlib import contextmanager
  
  # Third-party modules
  import pytest
  
  # Project modules
  from requests import Response
  from tests import request_is_valid
  
  
  def make_requests_get_mock(filename):
      def mockreturn(*args, **kwargs):
          response = Response()
          with open(os.path.join(os.path.dirname(__file__), '../assets', filename), 'r', 'utf-8') as fd:
              response._content = fd.read().encode('utf-8')
          return response
      return mockreturn
  
  
  class ContextualTest(object):
      def __init__(self, monkeypatch, manager, action, service):
          self.manager = manager
          self.action = action
          self.service = service
          monkeypatch.setattr('requests.post', make_requests_get_mock(self.action + '_response.xml'))
  
      def close(self):
          request = getattr(self.manager, self.service + '_request')
          assert request_is_valid(request, self.action, self.service)
  
  
  
subject: Use context manager for the offline tests