text: """Provide convenience methods for retrieving test data."""
  import os
  
  
  def data_path(*args):
      """Give the path to a test data file."""
      path = os.path.realpath(os.path.join(__file__, '../../../test_data', *args))
      assert os.path.exists(path)
      assert os.path.isabs(path)
      return path
  
  
  def read_file(*args, **kwargs):
      """Give the content (string) of a test data file."""
      path = kwargs.get('path', None)
      if not path:
          path = data_path(*args)
      with open(path, 'r') as testdata_fo:
          testdata_content = testdata_fo.read()
      return testdata_content
  