transactiontestcase fixtureteardown inhibits the postmigrate signal for test classes with serializedrollbacktrue self availableapps must be none to test the serializedrollback condition with a mocked callcommand this doesn t have any effect transactiontestcase presetup clears the connections querieslog so that it s less likely to overflow an overflow causes assertnumqueries to fail transactiontestcase _fixture_teardown inhibits the post_migrate signal for test classes with serialized_rollback true self available_apps must be none to test the serialized_rollback condition with a mocked call_command this doesn t have any effect enable query logging for test_queries_cleared transactiontestcase _pre_setup clears the connections queries_log so that it s less likely to overflow an overflow causes assertnumqueries to fail
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


class TestSerializedRollbackInhibitsPostMigrate(TransactionTestCase):
    

    available_apps = ["test_utils"]
    serialized_rollback = True

    def setUp(self):
        
        
        self.available_apps = None

    def tearDown(self):
        self.available_apps = ["test_utils"]

    @mock.patch("django.test.testcases.call_command")
    def test(self, call_command):
        
        self._fixture_teardown()
        call_command.assert_called_with(
            "flush",
            interactive=False,
            allow_cascade=False,
            reset_sequences=False,
            inhibit_post_migrate=True,
            database="default",
            verbosity=0,
        )


@override_settings(DEBUG=True)  
class TransactionTestCaseDatabasesTests(TestCase):
    available_apps = []
    databases = {"default", "other"}

    def test_queries_cleared(self):
        
        for alias in self.databases:
            self.assertEqual(
                len(connections[alias].queries_log), 0, "Failed for alias %s" % alias
            )


class DisallowedDatabaseQueriesTests(TransactionTestCase):
    available_apps = ["test_utils"]

    def test_disallowed_database_queries(self):
        message = (
            "Database queries to 'other' are not allowed in this test. "
            "Add 'other' to test_utils.test_transactiontestcase."
            "DisallowedDatabaseQueriesTests.databases to ensure proper test "
            "isolation and silence this failure."
        )
        with self.assertRaisesMessage(DatabaseOperationForbidden, message):
            Car.objects.using("other").get()