new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import unittest
  
  from ludobox.errors import LudoboxError
  
  class TestLudoboxError(unittest.TestCase):
      """Testing the Ludobox errors"""
  
      def test_message(self) :
          message = "some message"
          with self.assertRaises(LudoboxError) as cm:
              raise LudoboxError(message)
          self.assertEqual(
              message,
              str(cm.exception)
          )
  
subject: add error testing