django/tests/validators/tests.py

import os
import re
import types
from datetime import datetime, timedelta
from decimal import Decimal
from unittest import TestCase, mock

from django.core.exceptions import ValidationError
from django.core.files.base import ContentFile
from django.core.validators import (
    BaseValidator, DecimalValidator, EmailValidator, FileExtensionValidator,
    MaxLengthValidator, MaxValueValidator, MinLengthValidator,
    MinValueValidator, ProhibitNullCharactersValidator, RegexValidator,
    URLValidator, int_list_validator, validate_comma_separated_integer_list,
    validate_email, validate_image_file_extension, validate_integer,
    validate_ipv4_address, validate_ipv6_address, validate_ipv46_address,
    validate_slug, validate_unicode_slug,
)
from django.test import SimpleTestCase, ignore_warnings
from django.utils.deprecation import RemovedInDjango41Warning

try:
    from PIL import Image  # noqa
except ImportError:
    PILLOW_IS_INSTALLED = False
else:
    PILLOW_IS_INSTALLED = True

NOW = datetime.now()
EXTENDED_SCHEMES = ['http', 'https', 'ftp', 'ftps', 'git', 'file', 'git+ssh']

TEST_DATA = [
    # (validator, value, expected),
    (validate_integer, '42', None),
    (validate_integer, '-42', None),
    (validate_integer, -42, None),

    (validate_integer, -42.5, ValidationError),
    (validate_integer, None, ValidationError),
    (validate_integer, 'a', ValidationError),
    (validate_integer, '\n42', ValidationError),
    (validate_integer, '42\n', ValidationError),

    (validate_email, 'email@here.com', None),
    (validate_email, 'weirder-email@here.and.there.com', None),
    (validate_email, 'email@[127.0.0.1]', None),
    (validate_email, 'email@[2001:dB8::1]', None),
    (validate_email, 'email@[2001:dB8:0:0:0:0:0:1]', None),
    (validate_email, 'email@[::fffF:127.0.0.1]', None),
    (validate_email, 'example@valid-----hyphens.com', None),
    (validate_email, 'example@valid-with-hyphens.com', None),
    (validate_email, 'test@domain.with.idn.tld.उदाहरण.परीक्षा', None),
    (validate_email, 'email@localhost', None),
    (EmailValidator(allowlist=['localdomain']), 'email@localdomain', None),
    (validate_email, '"test@test"@example.com', None),
    (validate_email, 'example@atm.%s' % ('a' * 63), None),
    (validate_email, 'example@%s.atm' % ('a' * 63), None),
    (validate_email, 'example@%s.%s.atm' % ('a' * 63, 'b' * 10), None),

    (validate_email, 'example@atm.%s' % ('a' * 64), ValidationError),
    (validate_email, 'example@%s.atm.%s' % ('b' * 64, 'a' * 63), ValidationError),
    (validate_email, None, ValidationError),
    (validate_email, '', ValidationError),
    (validate_email, 'abc', ValidationError),
    (validate_email, 'abc@', ValidationError),
    (validate_email, 'abc@bar', ValidationError),
    (validate_email, 'a @x.cz', ValidationError),
    (validate_email, 'abc@.com', ValidationError),
    (validate_email, 'something@@somewhere.com', ValidationError),
    (validate_email, 'email@127.0.0.1', ValidationError),
    (validate_email, 'email@[127.0.0.256]', ValidationError),
    (validate_email, 'email@[2001:db8::12345]', ValidationError),
    (validate_email, 'email@[2001:db8:0:0:0:0:1]', ValidationError),
    (validate_email, 'email@[::ffff:127.0.0.256]', ValidationError),
    (validate_email, 'example@invalid-.com', ValidationError),
    (validate_email, 'example@-invalid.com', ValidationError),
    (validate_email, 'example@invalid.com-', ValidationError),
    (validate_email, 'example@inv-.alid-.com', ValidationError),
    (validate_email, 'example@inv-.-alid.com', ValidationError),
    (validate_email, 'test@example.com\n\n<script src="x.js">', ValidationError),
    # Quoted-string format (CR not allowed)
    (validate_email, '"\\\011"@here.com', None),
    (validate_email, '"\\\012"@here.com', ValidationError),
    (validate_email, 'trailingdot@shouldfail.com.', ValidationError),
    # Max length of domain name labels is 63 characters per RFC 1034.
    (validate_email, 'a@%s.us' % ('a' * 63), None),
    (validate_email, 'a@%s.us' % ('a' * 64), ValidationError),
    # Trailing newlines in username or domain not allowed
    (validate_email, 'a@b.com\n', ValidationError),
    (validate_email, 'a\n@b.com', ValidationError),
    (validate_email, '"test@test"\n@example.com', ValidationError),
    (validate_email, 'a@[127.0.0.1]\n', ValidationError),

    (validate_slug, 'slug-ok', None),
    (validate_slug, 'longer-slug-still-ok', None),
    (validate_slug, '--------', None),
    (validate_slug, 'nohyphensoranything', None),
    (validate_slug, 'a', None),
    (validate_slug, '1', None),
    (validate_slug, 'a1', None),

    (validate_slug, '', ValidationError),
    (validate_slug, ' text ', ValidationError),
    (validate_slug, ' ', ValidationError),
    (validate_slug, 'some@mail.com', ValidationError),
    (validate_slug, '你好', ValidationError),
    (validate_slug, '你 好', ValidationError),
    (validate_slug, '\n', ValidationError),
    (validate_slug, 'trailing-newline\n', ValidationError),

    (validate_unicode_slug, 'slug-ok', None),
    (validate_unicode_slug, 'longer-slug-still-ok', None),
    (validate_unicode_slug, '--------', None),
    (validate_unicode_slug, 'nohyphensoranything', None),
    (validate_unicode_slug, 'a', None),
    (validate_unicode_slug, '1', None),
    (validate_unicode_slug, 'a1', None),
    (validate_unicode_slug, '你好', None),

    (validate_unicode_slug, '', ValidationError),
    (validate_unicode_slug, ' text ', ValidationError),
    (validate_unicode_slug, ' ', ValidationError),
    (validate_unicode_slug, 'some@mail.com', ValidationError),
    (validate_unicode_slug, '\n', ValidationError),
    (validate_unicode_slug, '你 好', ValidationError),
    (validate_unicode_slug, 'trailing-newline\n', ValidationError),

    (validate_ipv4_address, '1.1.1.1', None),
    (validate_ipv4_address, '255.0.0.0', None),
    (validate_ipv4_address, '0.0.0.0', None),

    (validate_ipv4_address, '256.1.1.1', ValidationError),
    (validate_ipv4_address, '25.1.1.', ValidationError),
    (validate_ipv4_address, '25,1,1,1', ValidationError),
    (validate_ipv4_address, '25.1 .1.1', ValidationError),
    (validate_ipv4_address, '1.1.1.1\n', ValidationError),
    (validate_ipv4_address, '٧.2٥.3٣.243', ValidationError),

    # validate_ipv6_address uses django.utils.ipv6, which
    # is tested in much greater detail in its own testcase
    (validate_ipv6_address, 'fe80::1', None),
    (validate_ipv6_address, '::1', None),
    (validate_ipv6_address, '1:2:3:4:5:6:7:8', None),

    (validate_ipv6_address, '1:2', ValidationError),
    (validate_ipv6_address, '::zzz', ValidationError),
    (validate_ipv6_address, '12345::', ValidationError),

    (validate_ipv46_address, '1.1.1.1', None),
    (validate_ipv46_address, '255.0.0.0', None),
    (validate_ipv46_address, '0.0.0.0', None),
    (validate_ipv46_address, 'fe80::1', None),
    (validate_ipv46_address, '::1', None),
    (validate_ipv46_address, '1:2:3:4:5:6:7:8', None),

    (validate_ipv46_address, '256.1.1.1', ValidationError),
    (validate_ipv46_address, '25.1.1.', ValidationError),
    (validate_ipv46_address, '25,1,1,1', ValidationError),
    (validate_ipv46_address, '25.1 .1.1', ValidationError),
    (validate_ipv46_address, '1:2', ValidationError),
    (validate_ipv46_address, '::zzz', ValidationError),
    (validate_ipv46_address, '12345::', ValidationError),

    (validate_comma_separated_integer_list, '1', None),
    (validate_comma_separated_integer_list, '12', None),
    (validate_comma_separated_integer_list, '1,2', None),
    (validate_comma_separated_integer_list, '1,2,3', None),
    (validate_comma_separated_integer_list, '10,32', None),

    (validate_comma_separated_integer_list, '', ValidationError),
    (validate_comma_separated_integer_list, 'a', ValidationError),
    (validate_comma_separated_integer_list, 'a,b,c', ValidationError),
    (validate_comma_separated_integer_list, '1, 2, 3', ValidationError),
    (validate_comma_separated_integer_list, ',', ValidationError),
    (validate_comma_separated_integer_list, '1,2,3,', ValidationError),
    (validate_comma_separated_integer_list, '1,2,', ValidationError),
    (validate_comma_separated_integer_list, ',1', ValidationError),
    (validate_comma_separated_integer_list, '1,,2', ValidationError),

    (int_list_validator(sep='.'), '1.2.3', None),
    (int_list_validator(sep='.', allow_negative=True), '1.2.3', None),
    (int_list_validator(allow_negative=True), '-1,-2,3', None),
    (int_list_validator(allow_negative=True), '1,-2,-12', None),

    (int_list_validator(), '-1,2,3', ValidationError),
    (int_list_validator(sep='.'), '1,2,3', ValidationError),
    (int_list_validator(sep='.'), '1.2.3\n', ValidationError),

    (MaxValueValidator(10), 10, None),
    (MaxValueValidator(10), -10, None),
    (MaxValueValidator(10), 0, None),
    (MaxValueValidator(NOW), NOW, None),
    (MaxValueValidator(NOW), NOW - timedelta(days=1), None),

    (MaxValueValidator(0), 1, ValidationError),
    (MaxValueValidator(NOW), NOW + timedelta(days=1), ValidationError),

    (MinValueValidator(-10), -10, None),
    (MinValueValidator(-10), 10, None),
    (MinValueValidator(-10), 0, None),
    (MinValueValidator(NOW), NOW, None),
    (MinValueValidator(NOW), NOW + timedelta(days=1), None),

    (MinValueValidator(0), -1, ValidationError),
    (MinValueValidator(NOW), NOW - timedelta(days=1), ValidationError),

    # limit_value may be a callable.
    (MinValueValidator(lambda: 1), 0, ValidationError),
    (MinValueValidator(lambda: 1), 1, None),

    (MaxLengthValidator(10), '', None),
    (MaxLengthValidator(10), 10 * 'x', None),

    (MaxLengthValidator(10), 15 * 'x', ValidationError),

    (MinLengthValidator(10), 15 * 'x', None),
    (MinLengthValidator(10), 10 * 'x', None),

    (MinLengthValidator(10), '', ValidationError),

    (URLValidator(EXTENDED_SCHEMES), 'file://localhost/path', None),
    (URLValidator(EXTENDED_SCHEMES), 'git://example.com/', None),
    (URLValidator(EXTENDED_SCHEMES), 'git+ssh://git@github.com/example/hg-git.git', None),

    (URLValidator(EXTENDED_SCHEMES), 'git://-invalid.com', ValidationError),
    (URLValidator(), None, ValidationError),
    (URLValidator(), 56, ValidationError),
    (URLValidator(), 'no_scheme', ValidationError),
    # Newlines and tabs are not accepted.
    (URLValidator(), 'http://www.djangoproject.com/\n', ValidationError),
    (URLValidator(), 'http://[::ffff:192.9.5.5]\n', ValidationError),
    (URLValidator(), 'http://www.djangoproject.com/\r', ValidationError),
    (URLValidator(), 'http://[::ffff:192.9.5.5]\r', ValidationError),
    (URLValidator(), 'http://www.django\rproject.com/', ValidationError),
    (URLValidator(), 'http://[::\rffff:192.9.5.5]', ValidationError),
    (URLValidator(), 'http://\twww.djangoproject.com/', ValidationError),
    (URLValidator(), 'http://\t[::ffff:192.9.5.5]', ValidationError),
    # Trailing junk does not take forever to reject
    (URLValidator(), 'http://www.asdasdasdasdsadfm.com.br ', ValidationError),
    (URLValidator(), 'http://www.asdasdasdasdsadfm.com.br z', ValidationError),

    (BaseValidator(True), True, None),
    (BaseValidator(True), False, ValidationError),

    (RegexValidator(), '', None),
    (RegexValidator(), 'x1x2', None),
    (RegexValidator('[0-9]+'), 'xxxxxx', ValidationError),
    (RegexValidator('[0-9]+'), '1234', None),
    (RegexValidator(re.compile('[0-9]+')), '1234', None),
    (RegexValidator('.*'), '', None),
    (RegexValidator(re.compile('.*')), '', None),
    (RegexValidator('.*'), 'xxxxx', None),

    (RegexValidator('x'), 'y', ValidationError),
    (RegexValidator(re.compile('x')), 'y', ValidationError),
    (RegexValidator('x', inverse_match=True), 'y', None),
    (RegexValidator(re.compile('x'), inverse_match=True), 'y', None),
    (RegexValidator('x', inverse_match=True), 'x', ValidationError),
    (RegexValidator(re.compile('x'), inverse_match=True), 'x', ValidationError),

    (RegexValidator('x', flags=re.IGNORECASE), 'y', ValidationError),
    (RegexValidator('a'), 'A', ValidationError),
    (RegexValidator('a', flags=re.IGNORECASE), 'A', None),

    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithUnsupportedExt.jpg'), ValidationError),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithUnsupportedExt.JPG'), ValidationError),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithNoExtension'), ValidationError),
    (FileExtensionValidator(['']), ContentFile('contents', name='fileWithAnExtension.txt'), ValidationError),
    (FileExtensionValidator([]), ContentFile('contents', name='file.txt'), ValidationError),

    (FileExtensionValidator(['']), ContentFile('contents', name='fileWithNoExtension'), None),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='file.txt'), None),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='file.TXT'), None),
    (FileExtensionValidator(['TXT']), ContentFile('contents', name='file.txt'), None),
    (FileExtensionValidator(), ContentFile('contents', name='file.jpg'), None),

    (DecimalValidator(max_digits=2, decimal_places=2), Decimal('0.99'), None),
    (DecimalValidator(max_digits=2, decimal_places=1), Decimal('0.99'), ValidationError),
    (DecimalValidator(max_digits=3, decimal_places=1), Decimal('999'), ValidationError),
    (DecimalValidator(max_digits=4, decimal_places=1), Decimal('999'), None),
    (DecimalValidator(max_digits=20, decimal_places=2), Decimal('742403889818000000'), None),
    (DecimalValidator(20, 2), Decimal('7.42403889818E+17'), None),
    (DecimalValidator(max_digits=20, decimal_places=2), Decimal('7424742403889818000000'), ValidationError),
    (DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-1'), None),
    (DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-3'), ValidationError),
    (DecimalValidator(max_digits=5, decimal_places=5), Decimal('70E-5'), None),
    (DecimalValidator(max_digits=5, decimal_places=5), Decimal('70E-6'), ValidationError),
    # 'Enter a number.' errors
    *[
        (DecimalValidator(decimal_places=2, max_digits=10), Decimal(value), ValidationError)
        for value in (
            'NaN', '-NaN', '+NaN', 'sNaN', '-sNaN', '+sNaN',
            'Inf', '-Inf', '+Inf', 'Infinity', '-Infinity', '+Infinity',
        )
    ],

    (validate_image_file_extension, ContentFile('contents', name='file.jpg'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.png'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.PNG'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.txt'), ValidationError),
    (validate_image_file_extension, ContentFile('contents', name='file'), ValidationError),

    (ProhibitNullCharactersValidator(), '\x00something', ValidationError),
    (ProhibitNullCharactersValidator(), 'something', None),
    (ProhibitNullCharactersValidator(), None, None),
]


def create_path(filename):
    return os.path.abspath(os.path.join(os.path.dirname(__file__), filename))


# Add valid and invalid URL tests.
# This only tests the validator without extended schemes.
with open(create_path('valid_urls.txt'), encoding='utf8') as f:
    for url in f:
        TEST_DATA.append((URLValidator(), url.strip(), None))
with open(create_path('invalid_urls.txt'), encoding='utf8') as f:
    for url in f:
        TEST_DATA.append((URLValidator(), url.strip(), ValidationError))


class TestValidators(SimpleTestCase):

    def test_validators(self):
        for validator, value, expected in TEST_DATA:
            name = validator.__name__ if isinstance(validator, types.FunctionType) else validator.__class__.__name__
            exception_expected = expected is not None and issubclass(expected, Exception)
            with self.subTest(name, value=value):
                if validator is validate_image_file_extension and not PILLOW_IS_INSTALLED:
                    self.skipTest('Pillow is required to test validate_image_file_extension.')
                if exception_expected:
                    with self.assertRaises(expected):
                        validator(value)
                else:
                    self.assertEqual(expected, validator(value))

    def test_single_message(self):
        v = ValidationError('Not Valid')
        self.assertEqual(str(v), "['Not Valid']")
        self.assertEqual(repr(v), "ValidationError(['Not Valid'])")

    def test_message_list(self):
        v = ValidationError(['First Problem', 'Second Problem'])
        self.assertEqual(str(v), "['First Problem', 'Second Problem']")
        self.assertEqual(repr(v), "ValidationError(['First Problem', 'Second Problem'])")

    def test_message_dict(self):
        v = ValidationError({'first': ['First Problem']})
        self.assertEqual(str(v), "{'first': ['First Problem']}")
        self.assertEqual(repr(v), "ValidationError({'first': ['First Problem']})")

    def test_regex_validator_flags(self):
        msg = 'If the flags are set, regex must be a regular expression string.'
        with self.assertRaisesMessage(TypeError, msg):
            RegexValidator(re.compile('a'), flags=re.IGNORECASE)

    def test_max_length_validator_message(self):
        v = MaxLengthValidator(16, message='"%(value)s" has more than %(limit_value)d characters.')
        with self.assertRaisesMessage(ValidationError, '"djangoproject.com" has more than 16 characters.'):
            v('djangoproject.com')


class TestValidatorEquality(TestCase):
    """
    Validators have valid equality operators (#21638)
    """

    def test_regex_equality(self):
        self.assertEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
            RegexValidator(r'^(?:[0-9\.\-]*)://'),
        )
        self.assertEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
        )

        self.assertNotEqual(
            RegexValidator('', flags=re.IGNORECASE),
            RegexValidator(''),
        )

        self.assertNotEqual(
            RegexValidator(''),
            RegexValidator('', inverse_match=True),
        )

    def test_regex_equality_nocache(self):
        pattern = r'^(?:[a-z0-9\.\-]*)://'
        left = RegexValidator(pattern)
        re.purge()
        right = RegexValidator(pattern)

        self.assertEqual(
            left,
            right,
        )

    def test_regex_equality_blank(self):
        self.assertEqual(
            RegexValidator(),
            RegexValidator(),
        )

    def test_email_equality(self):
        self.assertEqual(
            EmailValidator(),
            EmailValidator(),
        )
        self.assertNotEqual(
            EmailValidator(message="BAD EMAIL"),
            EmailValidator(),
        )
        self.assertEqual(
            EmailValidator(message="BAD EMAIL", code="bad"),
            EmailValidator(message="BAD EMAIL", code="bad"),
        )

    def test_basic_equality(self):
        self.assertEqual(
            MaxValueValidator(44),
            MaxValueValidator(44),
        )
        self.assertEqual(MaxValueValidator(44), mock.ANY)
        self.assertNotEqual(
            MaxValueValidator(44),
            MinValueValidator(44),
        )
        self.assertNotEqual(
            MinValueValidator(45),
            MinValueValidator(11),
        )

    def test_decimal_equality(self):
        self.assertEqual(
            DecimalValidator(1, 2),
            DecimalValidator(1, 2),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            DecimalValidator(1, 1),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            DecimalValidator(2, 2),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            MinValueValidator(11),
        )

    def test_file_extension_equality(self):
        self.assertEqual(
            FileExtensionValidator(),
            FileExtensionValidator()
        )
        self.assertEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'])
        )
        self.assertEqual(
            FileExtensionValidator(['TXT']),
            FileExtensionValidator(['txt'])
        )
        self.assertEqual(
            FileExtensionValidator(['TXT', 'png']),
            FileExtensionValidator(['txt', 'png'])
        )
        self.assertEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], code='invalid_extension')
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['png'])
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['png', 'jpg'])
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], code='custom_code')
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], message='custom error message')
        )

    def test_prohibit_null_characters_validator_equality(self):
        self.assertEqual(
            ProhibitNullCharactersValidator(message='message', code='code'),
            ProhibitNullCharactersValidator(message='message', code='code')
        )
        self.assertEqual(
            ProhibitNullCharactersValidator(),
            ProhibitNullCharactersValidator()
        )
        self.assertNotEqual(
            ProhibitNullCharactersValidator(message='message1', code='code'),
            ProhibitNullCharactersValidator(message='message2', code='code')
        )
        self.assertNotEqual(
            ProhibitNullCharactersValidator(message='message', code='code1'),
            ProhibitNullCharactersValidator(message='message', code='code2')
        )


class DeprecationTests(SimpleTestCase):
    @ignore_warnings(category=RemovedInDjango41Warning)
    def test_whitelist(self):
        validator = EmailValidator(whitelist=['localdomain'])
        self.assertEqual(validator.domain_allowlist, ['localdomain'])
        self.assertIsNone(validator('email@localdomain'))
        self.assertEqual(validator.domain_allowlist, validator.domain_whitelist)

    def test_whitelist_warning(self):
        msg = "The whitelist argument is deprecated in favor of allowlist."
        with self.assertRaisesMessage(RemovedInDjango41Warning, msg):
            EmailValidator(whitelist='localdomain')

    @ignore_warnings(category=RemovedInDjango41Warning)
    def test_domain_whitelist(self):
        validator = EmailValidator()
        validator.domain_whitelist = ['mydomain']
        self.assertEqual(validator.domain_allowlist, ['mydomain'])
        self.assertEqual(validator.domain_allowlist, validator.domain_whitelist)

    def test_domain_whitelist_access_warning(self):
        validator = EmailValidator()
        msg = (
            'The domain_whitelist attribute is deprecated in favor of '
            'domain_allowlist.'
        )
        with self.assertRaisesMessage(RemovedInDjango41Warning, msg):
            validator.domain_whitelist

    def test_domain_whitelist_set_warning(self):
        validator = EmailValidator()
        msg = (
            'The domain_whitelist attribute is deprecated in favor of '
            'domain_allowlist.'
        )
        with self.assertRaisesMessage(RemovedInDjango41Warning, msg):
            validator.domain_whitelist = ['mydomain']