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import json
from unittest import mock
from django.apps import apps
from django.db import connections
from django.test import TestCase, TransactionTestCase, override_settings
from .models import Car
class TestSerializedContentMockMixin:
"""
Use this mixin on each test involving TransactionTestCase and
serialized_rollback = True option to avoid test dependencies. It mocks what
would be serialized after initial data migrations and restores it at the
end of the test.
"""
initial_data_migration = '[]'
_connections_test_serialized_content = {}
def _pre_setup(self):
for db_name in self._databases_names(include_mirrors=False):
self._connections_test_serialized_content[db_name] = connections[db_name]._test_serialized_contents
connections[db_name]._test_serialized_contents = self.initial_data_migration
super()._pre_setup()
def _post_teardown(self):
super()._post_teardown()
for db_name in self._databases_names(include_mirrors=False):
connections[db_name]._test_serialized_contents = self._connections_test_serialized_content[db_name]
@classmethod
def tearDownClass(cls):
super().tearDownClass()
# Clean up any data that has been created by the class.
for data in json.loads(cls.initial_data_migration):
model = apps.get_model(*data['model'].split('.'))
model.objects.filter(pk=data['pk']).delete()
class TestSerializedRollbackInhibitsPostMigrate(TestSerializedContentMockMixin, 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 TransactionTestCaseMultiDbTests(TestCase):
available_apps = []
multi_db = True
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 connections:
self.assertEqual(len(connections[alias].queries_log), 0, 'Failed for alias %s' % alias)
class TestDataRestoredOnTearDownIfSerializedRollback(TestSerializedContentMockMixin, TransactionTestCase):
"""
Initial data is recreated in TransactionTestCase._fixture_teardown()
after the database is flushed so it's available in next test.
"""
available_apps = ['test_utils']
_next_serialized_rollback = True
initial_data_migration = '[{"model": "test_utils.car", "pk": 666, "fields": {"name": "K 2000"}}]'
def _post_teardown(self):
super()._post_teardown()
# Won't be True if running the tests with --reverse.
if self._next_serialized_rollback:
self.assertTrue(Car.objects.exists())
def test(self):
pass # Should be the only one in this class.
class TestDataNotRestoredOnTearDownIfNotSerializedRollback(TestSerializedContentMockMixin, TransactionTestCase):
"""
Initial data isn't recreated in TransactionTestCase._fixture_teardown()
if _next_serialized_rollback is False.
"""
available_apps = ['test_utils']
_next_serialized_rollback = False
initial_data_migration = '[{"model": "test_utils.car", "pk": 666, "fields": {"name": "K 2000"}}]'
def _post_teardown(self):
super()._post_teardown()
self.assertFalse(Car.objects.exists())
def test(self):
pass # Should be the only one in this class.
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