Fixed #33278 -- Improved error for connection/query attempts against disallowed databases in tests.

tests/test_utils/test_transactiontestcase.py

@@ -2,6 +2,7 @@ from unittest import mock
 
 from django.db import connections
 from django.test import TestCase, TransactionTestCase, override_settings
+from django.test.testcases import DatabaseOperationForbidden
 
 from .models import Car
 
@@ -58,5 +59,5 @@ class DisallowedDatabaseQueriesTests(TransactionTestCase):
             "DisallowedDatabaseQueriesTests.databases to ensure proper test "
             "isolation and silence this failure."
         )
-        with self.assertRaisesMessage(AssertionError, message):
+        with self.assertRaisesMessage(DatabaseOperationForbidden, message):
             Car.objects.using('other').get()