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from unittest import mock, skipUnless
from django.db import OperationalError, connection
from django.test import TestCase
@skipUnless(connection.vendor == 'sqlite', 'SQLite tests.')
class FeaturesTests(TestCase):
def test_supports_json_field_operational_error(self):
if hasattr(connection.features, 'supports_json_field'):
del connection.features.supports_json_field
msg = 'unable to open database file'
with mock.patch(
'django.db.backends.base.base.BaseDatabaseWrapper.cursor',
side_effect=OperationalError(msg),
):
with self.assertRaisesMessage(OperationalError, msg):
connection.features.supports_json_field
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