text: """
  Use this module to get and run all tk tests.
  
  Tkinter tests should live in a package inside the directory where this file
  lives, like test_tkinter.
  Extensions also should live in packages following the same rule as above.
  """
  
  import os
  import sys
  import unittest
  import importlib
  import test.test_support
  
  this_dir_path = os.path.abspath(os.path.dirname(__file__))
  
  def is_package(path):
      for name in os.listdir(path):
          if name in ('__init__.py', '__init__.pyc', '__init.pyo'):
              return True
      return False
  
  def get_tests_modules(basepath=this_dir_path, gui=True, packages=None):
      """This will import and yield modules whose names start with test_
      and are inside packages found in the path starting at basepath.
  
      If packages is specified it should contain package names that want
      their tests colleted.
      """
      py_ext = '.py'
  
      for dirpath, dirnames, filenames in os.walk(basepath):
          for dirname in list(dirnames):
              if dirname[0] == '.':
                  dirnames.remove(dirname)
  
          if is_package(dirpath) and filenames:
              pkg_name = dirpath[len(basepath) + len(os.sep):].replace('/', '.')
              if packages and pkg_name not in packages:
                  continue
  
              filenames = filter(
                      lambda x: x.startswith('test_') and x.endswith(py_ext),
                      filenames)
  
              for name in filenames:
                  try:
                      yield importlib.import_module(
                              ".%s" % name[:-len(py_ext)], pkg_name)
                  except test.test_support.ResourceDenied:
                      if gui:
                          raise
  
  def get_tests(text=True, gui=True, packages=None):
      """Yield all the tests in the modules found by get_tests_modules.
  
      If nogui is True, only tests that do not require a GUI will be
      returned."""
      attrs = []
      if text:
          attrs.append('tests_nogui')
      if gui:
          attrs.append('tests_gui')
      for module in get_tests_modules(gui=gui, packages=packages):
          for attr in attrs:
              for test in getattr(module, attr, ()):
                  yield test
  
  if __name__ == "__main__":
      test.test_support.use_resources = ['gui']
      test.test_support.run_unittest(*get_tests())
  