117 lines
4.2 KiB
Python
117 lines
4.2 KiB
Python
import json
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from unittest import mock
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from django.apps import apps
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from django.db import connections
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from django.test import TestCase, TransactionTestCase, override_settings
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from .models import Car
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class TestSerializedContentMockMixin:
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"""
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Use this mixin on each test involving TransactionTestCase and
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serialized_rollback = True option to avoid test dependencies. It mocks what
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would be serialized after initial data migrations and restores it at the
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end of the test.
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"""
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initial_data_migration = '[]'
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_connections_test_serialized_content = {}
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def _pre_setup(self):
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for db_name in self._databases_names(include_mirrors=False):
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self._connections_test_serialized_content[db_name] = connections[db_name]._test_serialized_contents
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connections[db_name]._test_serialized_contents = self.initial_data_migration
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super()._pre_setup()
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def _post_teardown(self):
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super()._post_teardown()
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for db_name in self._databases_names(include_mirrors=False):
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connections[db_name]._test_serialized_contents = self._connections_test_serialized_content[db_name]
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@classmethod
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def tearDownClass(cls):
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super().tearDownClass()
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# Clean up any data that has been created by the class.
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for data in json.loads(cls.initial_data_migration):
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model = apps.get_model(*data['model'].split('.'))
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model.objects.filter(pk=data['pk']).delete()
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class TestSerializedRollbackInhibitsPostMigrate(TestSerializedContentMockMixin, TransactionTestCase):
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"""
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TransactionTestCase._fixture_teardown() inhibits the post_migrate signal
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for test classes with serialized_rollback=True.
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"""
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available_apps = ['test_utils']
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serialized_rollback = True
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def setUp(self):
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# self.available_apps must be None to test the serialized_rollback
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# condition.
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self.available_apps = None
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def tearDown(self):
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self.available_apps = ['test_utils']
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@mock.patch('django.test.testcases.call_command')
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def test(self, call_command):
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# with a mocked call_command(), this doesn't have any effect.
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self._fixture_teardown()
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call_command.assert_called_with(
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'flush', interactive=False, allow_cascade=False,
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reset_sequences=False, inhibit_post_migrate=True,
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database='default', verbosity=0,
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)
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@override_settings(DEBUG=True) # Enable query logging for test_queries_cleared
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class TransactionTestCaseMultiDbTests(TestCase):
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available_apps = []
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multi_db = True
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def test_queries_cleared(self):
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"""
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TransactionTestCase._pre_setup() clears the connections' queries_log
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so that it's less likely to overflow. An overflow causes
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assertNumQueries() to fail.
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"""
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for alias in connections:
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self.assertEqual(len(connections[alias].queries_log), 0, 'Failed for alias %s' % alias)
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class TestDataRestoredOnTearDownIfSerializedRollback(TestSerializedContentMockMixin, TransactionTestCase):
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"""
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Initial data is recreated in TransactionTestCase._fixture_teardown()
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after the database is flushed so it's available in next test.
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"""
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available_apps = ['test_utils']
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_next_serialized_rollback = True
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initial_data_migration = '[{"model": "test_utils.car", "pk": 666, "fields": {"name": "K 2000"}}]'
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def _post_teardown(self):
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super()._post_teardown()
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# Won't be True if running the tests with --reverse.
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if self._next_serialized_rollback:
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self.assertTrue(Car.objects.exists())
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def test(self):
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pass # Should be the only one in this class.
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class TestDataNotRestoredOnTearDownIfNotSerializedRollback(TestSerializedContentMockMixin, TransactionTestCase):
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"""
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Initial data isn't recreated in TransactionTestCase._fixture_teardown()
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if _next_serialized_rollback is False.
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"""
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available_apps = ['test_utils']
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_next_serialized_rollback = False
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initial_data_migration = '[{"model": "test_utils.car", "pk": 666, "fields": {"name": "K 2000"}}]'
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def _post_teardown(self):
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super()._post_teardown()
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self.assertFalse(Car.objects.exists())
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def test(self):
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pass # Should be the only one in this class.
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