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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):
"""
TransactionTestCase._fixture_teardown() inhibits the post_migrate signal
for test classes with serialized_rollback=True.
"""
available_apps = ["test_utils"]
serialized_rollback = True
def setUp(self):
# self.available_apps must be None to test the serialized_rollback
# condition.
self.available_apps = None
def tearDown(self):
self.available_apps = ["test_utils"]
@mock.patch("django.test.testcases.call_command")
def test(self, call_command):
# with a mocked call_command(), this doesn't have any effect.
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) # Enable query logging for test_queries_cleared
class TransactionTestCaseDatabasesTests(TestCase):
available_apps = []
databases = {"default", "other"}
def test_queries_cleared(self):
"""
TransactionTestCase._pre_setup() clears the connections' queries_log
so that it's less likely to overflow. An overflow causes
assertNumQueries() to fail.
"""
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()
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