text: from unittest import TestCase
  
  import hodgepodge.networking
  
  
  class NetworkTestCases(TestCase):
      def test_parse_mac_address(self):
          for mac_address, expected in (
              ('00-23-3a-99-0c-21', '00:23:3a:99:0c:21'),
              ('00233a990c21', '00:23:3a:99:0c:21'),
              ('00:23:3A:99:0C:21', '00:23:3a:99:0c:21'),
          ):
              with self.subTest(mac_address=mac_address, expected=expected):
                  result = hodgepodge.networking.parse_mac_address(mac_address)
                  self.assertEqual(expected, result)
  