old_contents: # coding: utf-8
  
  import sys
  
  if sys.version_info.major <= 2 and sys.version_info.minor < 7:  # pragma: no cover
      import unittest2 as unittest                                # pragma: no cover
  else:                                                           # pragma: no cover
      import unittest
  
new_contents: # coding: utf-8
  
  import sys
  
  if sys.version_info[0] <= 2 and sys.version_info[1] < 7:  # pragma: no cover
      import unittest2 as unittest
  else:  # pragma: no cover
      import unittest
  
subject: Fix test compatibility layer.