old_contents: from unittest import TestCase
  
  from win_unc import validators as V
  
  
  class TestIsValidDriveLetter(TestCase):
      def test_valid(self):
          self.assertTrue(V.is_valid_drive_letter('A'))
          self.assertTrue(V.is_valid_drive_letter('Z'))
          self.assertTrue(V.is_valid_drive_letter('a'))
          self.assertTrue(V.is_valid_drive_letter('z'))
  
      def test_invalid(self):
          self.assertFalse(V.is_valid_drive_letter(''))
          self.assertFalse(V.is_valid_drive_letter(':'))
          self.assertFalse(V.is_valid_drive_letter('aa'))
          self.assertFalse(V.is_valid_drive_letter('a:'))
  
new_contents: from unittest import TestCase
  
  from win_unc import validators as V
  
  
  class TestIsValidDriveLetter(TestCase):
      def test_valid(self):
          self.assertTrue(V.is_valid_drive_letter('A'))
          self.assertTrue(V.is_valid_drive_letter('Z'))
          self.assertTrue(V.is_valid_drive_letter('a'))
          self.assertTrue(V.is_valid_drive_letter('z'))
  
      def test_invalid(self):
          self.assertFalse(V.is_valid_drive_letter(''))
          self.assertFalse(V.is_valid_drive_letter(':'))
          self.assertFalse(V.is_valid_drive_letter('aa'))
          self.assertFalse(V.is_valid_drive_letter('a:'))
  
  
  class TestIsValidUncPath(TestCase):
      def test_valid(self):
          self.assertTrue(V.is_valid_unc_path(r'\\a'))
          self.assertTrue(V.is_valid_unc_path(r'\\a\b\c'))
          self.assertTrue(V.is_valid_unc_path(r'\\ABC\\'))
  
      def test_invalid(self):
          self.assertFalse(V.is_valid_unc_path(''))
          self.assertFalse(V.is_valid_unc_path(r'\\'))
          self.assertFalse(V.is_valid_unc_path(r'\\\a'))
          self.assertFalse(V.is_valid_unc_path(r'C:\path'))
          self.assertFalse(V.is_valid_unc_path(r'\\<a>'))
  
subject: Add tests for UNC path validator