Add cast

Author: adamchainz

tests/testapp/test_dynamicfield.py

@@ -2,13 +2,15 @@
 
 import datetime as dt
 import json
+from typing import cast
 from unittest import SkipTest, mock
 
 import mariadb_dyncol
 import pytest
 from django.core import serializers
 from django.core.exceptions import FieldError
 from django.db import connection, connections, models
+from django.db.backends.mysql.base import DatabaseWrapper
 from django.db.migrations.writer import MigrationWriter
 from django.db.models import CharField, Transform
 from django.test import TestCase
@@ -22,7 +24,7 @@
 class DynColTestCase(TestCase):
     @classmethod
     def setUpClass(cls):
-        if not connection.mysql_is_mariadb:
+        if not cast(DatabaseWrapper, connection).mysql_is_mariadb:
             raise SkipTest("Dynamic Columns require MariaDB")
         super().setUpClass()