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Fixed #31117 -- Isolated backends.base.test_creation.TestDbCreationTests. 

Previously, this test could modify global state by changing
connection.settings_dict. This dict is a reference to the same dict as
django.db.connections.databases['default'], which is thus also changed.
The cleanup of this test would replace connection.settings_dic` with a
saved copy, which would leave the dict itself modified.

Additionally, create_test_db() would also modify these same dicts, as
well as settings.databases['default']['NAME'] by adding a "test_"
prefix, which is what can cause problems later.

This patch:
 - makes a complete copy of the connection and work on that, to improve
   isolation.
 - calls destroy_test_db() to let that code clean up anything done by
   create_test_db().
This commit is contained in:
Matthijs Kooijman 2020-01-18 19:59:56 +01:00 committed by Mariusz Felisiak
parent f34be5294d
commit b64b1b2e1a
1 changed files with 12 additions and 8 deletions
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20
tests/backends/base/test_creation.py
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@ -49,23 +49,27 @@ class TestDbSignatureTests(SimpleTestCase):
@mock.patch('django.core.management.commands.migrate.Command.handle', return_value=None)
class TestDbCreationTests(SimpleTestCase):
def test_migrate_test_setting_false(self, mocked_migrate, mocked_ensure_connection):
creation = connection.creation_class(connection)
saved_settings = copy.deepcopy(connection.settings_dict)
test_connection = get_connection_copy()
test_connection.settings_dict['TEST']['MIGRATE'] = False
creation = test_connection.creation_class(test_connection)
old_database_name = test_connection.settings_dict['NAME']
try:
connection.settings_dict['TEST']['MIGRATE'] = False
with mock.patch.object(creation, '_create_test_db'):
creation.create_test_db(verbosity=0, autoclobber=True, serialize=False)
mocked_migrate.assert_not_called()
finally:
connection.settings_dict = saved_settings
with mock.patch.object(creation, '_destroy_test_db'):
creation.destroy_test_db(old_database_name, verbosity=0)
def test_migrate_test_setting_true(self, mocked_migrate, mocked_ensure_connection):
creation = connection.creation_class(connection)
saved_settings = copy.deepcopy(connection.settings_dict)
test_connection = get_connection_copy()
test_connection.settings_dict['TEST']['MIGRATE'] = True
creation = test_connection.creation_class(test_connection)
old_database_name = test_connection.settings_dict['NAME']
try:
connection.settings_dict['TEST']['MIGRATE'] = True
with mock.patch.object(creation, '_create_test_db'):
creation.create_test_db(verbosity=0, autoclobber=True, serialize=False)
mocked_migrate.assert_called_once()
finally:
connection.settings_dict = saved_settings
with mock.patch.object(creation, '_destroy_test_db'):
creation.destroy_test_db(old_database_name, verbosity=0)