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119 lines
4.4 KiB
Python
119 lines
4.4 KiB
Python
import unittest
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from contextlib import contextmanager
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from unittest import mock
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from django.core.exceptions import ImproperlyConfigured
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from django.db import NotSupportedError, connection
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from django.test import TestCase, override_settings
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@contextmanager
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def get_connection():
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new_connection = connection.copy()
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yield new_connection
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new_connection.close()
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@override_settings(DEBUG=True)
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@unittest.skipUnless(connection.vendor == "mysql", "MySQL tests")
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class IsolationLevelTests(TestCase):
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read_committed = "read committed"
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repeatable_read = "repeatable read"
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isolation_values = {
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level: level.upper() for level in (read_committed, repeatable_read)
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}
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@classmethod
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def setUpClass(cls):
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super().setUpClass()
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configured_isolation_level = (
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connection.isolation_level or cls.isolation_values[cls.repeatable_read]
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)
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cls.configured_isolation_level = configured_isolation_level.upper()
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cls.other_isolation_level = (
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cls.read_committed
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if configured_isolation_level != cls.isolation_values[cls.read_committed]
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else cls.repeatable_read
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)
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@staticmethod
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def get_isolation_level(connection):
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with connection.cursor() as cursor:
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cursor.execute(
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"SHOW VARIABLES "
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"WHERE variable_name IN ('transaction_isolation', 'tx_isolation')"
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)
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return cursor.fetchone()[1].replace("-", " ")
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def test_auto_is_null_auto_config(self):
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query = "set sql_auto_is_null = 0"
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connection.init_connection_state()
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last_query = connection.queries[-1]["sql"].lower()
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if connection.features.is_sql_auto_is_null_enabled:
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self.assertIn(query, last_query)
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else:
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self.assertNotIn(query, last_query)
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def test_connect_isolation_level(self):
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self.assertEqual(
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self.get_isolation_level(connection), self.configured_isolation_level
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)
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def test_setting_isolation_level(self):
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with get_connection() as new_connection:
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new_connection.settings_dict["OPTIONS"][
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"isolation_level"
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] = self.other_isolation_level
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.other_isolation_level],
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)
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def test_uppercase_isolation_level(self):
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# Upper case values are also accepted in 'isolation_level'.
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with get_connection() as new_connection:
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new_connection.settings_dict["OPTIONS"][
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"isolation_level"
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] = self.other_isolation_level.upper()
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.other_isolation_level],
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)
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def test_default_isolation_level(self):
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# If not specified in settings, the default is read committed.
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with get_connection() as new_connection:
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new_connection.settings_dict["OPTIONS"].pop("isolation_level", None)
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.read_committed],
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)
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def test_isolation_level_validation(self):
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new_connection = connection.copy()
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new_connection.settings_dict["OPTIONS"]["isolation_level"] = "xxx"
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msg = (
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"Invalid transaction isolation level 'xxx' specified.\n"
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"Use one of 'read committed', 'read uncommitted', "
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"'repeatable read', 'serializable', or None."
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)
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with self.assertRaisesMessage(ImproperlyConfigured, msg):
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new_connection.cursor()
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@unittest.skipUnless(connection.vendor == "mysql", "MySQL tests")
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class Tests(TestCase):
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@mock.patch.object(connection, "get_database_version")
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def test_check_database_version_supported(self, mocked_get_database_version):
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if connection.mysql_is_mariadb:
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mocked_get_database_version.return_value = (10, 3)
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msg = "MariaDB 10.4 or later is required (found 10.3)."
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else:
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mocked_get_database_version.return_value = (5, 7)
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msg = "MySQL 8 or later is required (found 5.7)."
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with self.assertRaisesMessage(NotSupportedError, msg):
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connection.check_database_version_supported()
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self.assertTrue(mocked_get_database_version.called)
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