new_contents: import contextlib
  import os
  import os.path
  
  import mock
  import requests
  
  
  @contextlib.contextmanager
  def mocked_requests(path):
      """mocks the requests library to return a given file's content"""
      # if environment variable is set, then don't mock the tests just grab files
      # over the network. Example:
      #    env ULMO_DONT_MOCK_TESTS=1 py.test
      if os.environ.get('ULMO_DONT_MOCK_TESTS', False):
          yield
  
      else:
          test_path = test_file_path(path)
  
          with open(test_path, 'rb') as f:
              mock_response = requests.Response()
              mock_response.status_code = 200
              mock_response.raw = f
  
              with mock.patch('requests.get', return_value=mock_response):
                  yield
  
  
  def test_file_path(file_path):
      """translates a file path to be relative to the test files directory"""
      return os.path.join(os.path.dirname(__file__), 'files', file_path)
  
subject: add a set of test utils that will be useful for running tests