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.object(

            connection,

            "cursor",

            side_effect=OperationalError(msg),

        ):

            with self.assertRaisesMessage(OperationalError, msg):

                connection.features.supports_json_field