old_contents: import unittest
  from pymodbus3.version import Version
  
  
  class ModbusVersionTest(unittest.TestCase):
      """
      This is the unittest for the pymodbus3._version code
      """
  
      def setUp(self):
          """ Initializes the test environment """
          pass
  
      def tearDown(self):
          """ Cleans up the test environment """
          pass
  
      def test_version_class(self):
          version = Version('test', 1, 2, 3)
          self.assertEqual(version.short(), '1.2.3')
          self.assertEqual(str(version), '[test, version 1.2.3]')
  
  #---------------------------------------------------------------------------#
  # Main
  #---------------------------------------------------------------------------#
  if __name__ == "__main__":
      unittest.main()
  
new_contents: import unittest
  from pymodbus3.version import Version
  
  
  class ModbusVersionTest(unittest.TestCase):
      """
      This is the unittest for the pymodbus3._version code
      """
  
      def setUp(self):
          """ Initializes the test environment """
          pass
  
      def tearDown(self):
          """ Cleans up the test environment """
          pass
  
      def test_version_class(self):
          version = Version('test', 1, 2, 3)
          self.assertEqual(version.short(), '1.2.3')
          self.assertEqual(str(version), '[test, version 1.2.3]')
  
  
  # Main
  if __name__ == "__main__":
      unittest.main()
  
subject: Improve PEP8.