old_contents: import os
  import sys
  import ttk
  from _tkinter import TclError
  from test import test_support
  
  try:
      ttk.Button()
  except TclError, msg:
      # assuming ttk is not available
      raise unittest.SkipTest("ttk not available: %s" % msg)
  
  this_dir = os.path.dirname(os.path.abspath(__file__))
  lib_tk_test = os.path.abspath(os.path.join(this_dir, os.path.pardir,
      'lib-tk', 'test'))
  if lib_tk_test not in sys.path:
      sys.path.append(lib_tk_test)
  
  import runtktests
  
  def test_main(enable_gui=False):
      if enable_gui:
          if test_support.use_resources is None:
              test_support.use_resources = ['gui']
          elif 'gui' not in test_support.use_resources:
              test_support.use_resources.append('gui')
  
      test_support.run_unittest(
              *runtktests.get_tests(text=False, packages=['test_ttk']))
  
  if __name__ == '__main__':
      test_main(enable_gui=True)
  
new_contents: import os
  import sys
  import ttk
  import unittest
  from _tkinter import TclError
  from test import test_support
  
  try:
      ttk.Button()
  except TclError, msg:
      # assuming ttk is not available
      raise unittest.SkipTest("ttk not available: %s" % msg)
  
  this_dir = os.path.dirname(os.path.abspath(__file__))
  lib_tk_test = os.path.abspath(os.path.join(this_dir, os.path.pardir,
      'lib-tk', 'test'))
  if lib_tk_test not in sys.path:
      sys.path.append(lib_tk_test)
  
  import runtktests
  
  def test_main(enable_gui=False):
      if enable_gui:
          if test_support.use_resources is None:
              test_support.use_resources = ['gui']
          elif 'gui' not in test_support.use_resources:
              test_support.use_resources.append('gui')
  
      test_support.run_unittest(
              *runtktests.get_tests(text=False, packages=['test_ttk']))
  
  if __name__ == '__main__':
      test_main(enable_gui=True)
  
subject: add missing import