text: from __future__ import print_function
  from matplotlib import rcParams, rcdefaults, use
  
  import difflib
  
  
  _multiprocess_can_split_ = True
  
  
  def setup():
      use('Agg', warn=False) # use Agg backend for these tests
  
      # These settings *must* be hardcoded for running the comparison
      # tests and are not necessarily the default values as specified in
      # rcsetup.py
      rcdefaults() # Start with all defaults
      rcParams['font.family'] = 'Bitstream Vera Sans'
      rcParams['text.hinting'] = False
      rcParams['text.hinting_factor'] = 8
  
  
  def assert_str_equal(reference_str, test_str,
                       format_str='String {str1} and {str2} do not match:\n{differences}'):
      """
      Assert the two strings are equal. If not, fail and print their diffs using difflib.
  
      """
      if reference_str != test_str:
          diff = difflib.unified_diff(reference_str.splitlines(1),
                                      test_str.splitlines(1),
                                      'Reference', 'Test result',
                                      '', '', 0)
          raise ValueError(format_str.format(str1=reference_str,
                                             str2=test_str,
                                             differences=''.join(diff)))
  