old_contents: import unittest
  import single_db_create_env
  import single_db_open_exist_env
  import single_db_create_env_load_u32
  import single_db_open_exist_env_read_u32
   
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  
  testmodules = [
      'single_db_create_env'
     ,'single_db_create_env_load_u32'
     ,'single_db_open_exist_env'
     ,'single_db_open_exist_env_read_u32'
      ]
  
  suite = unittest.TestSuite()
  
  for t in testmodules:
      try:
          mod = __import__(t, globals(), locals(), ['suite'])
          suitefn = getattr(mod, 'suite')
          suite.addTest(suitefn())
      except (ImportError, AttributeError):
          suite.addTest(unittest.defaultTestLoader.loadTestsFromName(t))
  
  unittest.TextTestRunner().run(suite)
  
  
  
subject: add test suite