old_contents: import unittest
  from decimal import Decimal as D
  from oscar_vat_moss.fields import *  # noqa
  from django.core.exceptions import ValidationError
  
  
  class VATINValidatorTest(unittest.TestCase):
      VALID_VATINS = (
          # VATIN         # Company name
          ('ATU66688202', 'hastexo Professional Services GmbH'),
          ('ATU66688202', 'HASTEXO PROFESSIONAL SERVICES GMBH'),
          ('ATU66688202', 'hastexo Professional Services GmbH (Procurement Department)'),
          )
      INVALID_VATINS = (
          # VATIN         # Incorrect company name
          ('ATU66688999', 'Example, Inc.'),
          ('ATU99999999', 'Acme, Inc'),
          )
  
      def test_valid_vatin(self):
          validator = VATINValidator(None)
          for vatin, name in self.VALID_VATINS:
              # Just ensure this doesn't fail
              validator.validate_vatin(vatin)
              # validator is also callable
              validator(vatin)
  
      def test_invalid_vatin(self):
          validator = VATINValidator(None)
          for vatin, name in self.INVALID_VATINS:
              with self.assertRaises(ValidationError):
                  validator.validate_vatin(vatin)
  
              with self.assertRaises(ValidationError):
                  # validator is also callable
                  validator(vatin)
  
  
  class VATINFieldTest(unittest.TestCase):
      
      def test_default_properties(self):
          field = VATINField()
          validator_classes = [ v.__class__ for v in field.validators ]
          self.assertTrue(VATINValidator in validator_classes)
          self.assertEqual(field.max_length, DEFAULT_MAX_LENGTH)
  
      def test_convenience_method(self):
          field = vatin()
          validator_classes = [ v.__class__ for v in field.validators ]
          self.assertTrue(VATINValidator in validator_classes)
          self.assertEqual(field.max_length, DEFAULT_MAX_LENGTH)
          self.assertEqual(field.name,'vatin')
          self.assertTrue(field.blank)
  
new_contents: import unittest
  from decimal import Decimal as D
  from oscar_vat_moss.fields import *  # noqa
  from django.core.exceptions import ValidationError
  
  
  class VATINValidatorTest(unittest.TestCase):
      VALID_VATINS = (
          # VATIN         # Company name
          ('ATU66688202', 'hastexo Professional Services GmbH'),
          ('ATU66688202', 'HASTEXO PROFESSIONAL SERVICES GMBH'),
          ('ATU66688202', 'hastexo Professional Services GmbH (Procurement Department)'),
          )
      INVALID_VATINS = (
          # VATIN         # Incorrect company name
          ('ATU66688999', 'Example, Inc.'),
          ('ATU99999999', 'Acme, Inc'),
          )
  
      def test_valid_vatin(self):
          validator = VATINValidator(None)
          for vatin, name in self.VALID_VATINS:
              # Just ensure this doesn't fail
              validator.validate_vatin(vatin)
              # validator is also callable
              validator(vatin)
  
      def test_invalid_vatin(self):
          validator = VATINValidator(None)
          for vatin, name in self.INVALID_VATINS:
              with self.assertRaises(ValidationError):
                  validator.validate_vatin(vatin)
  
              with self.assertRaises(ValidationError):
                  # validator is also callable
                  validator(vatin)
  
  
  class VATINFieldTest(unittest.TestCase):
      
      def test_default_properties(self):
          field = VATINField()
          validator_classes = [ v.__class__ for v in field.validators ]
          self.assertTrue(VATINValidator in validator_classes)
          self.assertEqual(field.max_length, DEFAULT_MAX_LENGTH)
  
      def test_convenience_method(self):
          field = vatin()
          validator_classes = [ v.__class__ for v in field.validators ]
          self.assertTrue(VATINValidator in validator_classes)
          self.assertEqual(field.max_length, DEFAULT_MAX_LENGTH)
          self.assertEqual(field.name,'vatin')
          self.assertTrue(field.blank)
  
      def test_formfield(self):
          field = vatin()
  
          # Just ensure this doesn't fail
          formfield = field.formfield()
  
      def test_deconstruct(self):
          field = vatin()
  
          name, path, args, kwargs = field.deconstruct()
          self.assertEqual(name, 'vatin')
  
subject: Add unit tests for VATINField