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from unittest import mock
from django.core.checks import Error
from django.db import connections, models
from django.test import SimpleTestCase
from django.test.utils import isolate_apps
def dummy_allow_migrate(db, app_label, **hints):
# Prevent checks from being run on the 'other' database, which doesn't have
# its check_field() method mocked in the test.
return db == 'default'
@isolate_apps('invalid_models_tests')
class BackendSpecificChecksTests(SimpleTestCase):
@mock.patch('django.db.models.fields.router.allow_migrate', new=dummy_allow_migrate)
def test_check_field(self):
""" Test if backend specific checks are performed. """
error = Error('an error')
class Model(models.Model):
field = models.IntegerField()
field = Model._meta.get_field('field')
with mock.patch.object(connections['default'].validation, 'check_field', return_value=[error]):
self.assertEqual(field.check(databases={'default'}), [error])
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