old_contents: """Simple script to show reference holding behavior.
  
  This is used by a companion test case.
  """
  from __future__ import print_function
  
  import gc
  
  class C(object):
     def __del__(self):
        pass
        #print 'deleting object...'  # dbg
  
  if __name__ == '__main__':
     c = C()
  
     c_refs = gc.get_referrers(c)
     ref_ids = map(id,c_refs)
  
     print('c referrers:',map(type,c_refs))
  
new_contents: """Simple script to show reference holding behavior.
  
  This is used by a companion test case.
  """
  from __future__ import print_function
  
  import gc
  
  class C(object):
     def __del__(self):
        pass
        #print 'deleting object...'  # dbg
  
  if __name__ == '__main__':
     c = C()
  
     c_refs = gc.get_referrers(c)
     ref_ids = list(map(id,c_refs))
  
     print('c referrers:',list(map(type,c_refs)))
  
subject: Fix tests for IPython.testing