old_contents: import os
  import sys
  from unittest import TestCase
  
  sys.path.append(os.path.abspath("."))
  from diffios import DiffiosDiff
  
  
  # class DiffiosDiffTest(TestCase):
  
  
  
new_contents: import os
  import sys
  from unittest import TestCase
  
  sys.path.append(os.path.abspath("."))
  from diffios import DiffiosDiff
  
  
  class DiffiosDiffTest(TestCase):
  
      def test_different_vlan_interface_config(self):
          baseline = [
              'hostname BASELINE',
              'interface Vlan1',
              ' no ip address',
              ' shutdown'
          ]
          comparison = [
              'hostname COMPARISON',
              'interface Vlan1',
              ' ip address 192.168.0.1 255.255.255.0',
              ' no shutdown'
          ]
          expected_additional = [[
              'interface Vlan1',
              ' ip address 192.168.0.1 255.255.255.0',
              ' no shutdown'
          ]]
          expected_missing = [[
              'interface Vlan1',
              ' no ip address',
              ' shutdown'
          ]]
          diff = DiffiosDiff(baseline=baseline, comparison=comparison)
          actual_additional = diff.additional
          actual_missing = diff.missing
          self.assertEqual(expected_additional, actual_additional)
          self.assertEqual(expected_missing, actual_missing)
  
subject: add first DiffiosDiff test