How to use migrate_down method in autotest

Best Python code snippet using autotest_python

test_migrations.py

Source:test_migrations.py

...57        self._check_141 = mock.MagicMock()58        self.migrate_up(141, True)59        self._pre_upgrade_141.assert_called_with(self.engine)60        self._check_141.assert_called_with(self.engine, test_value)61    def test_migrate_down(self):62        self.migration_api.db_version.return_value = 4263        self.assertTrue(self.migrate_down(42))64        self.migration_api.db_version.assert_called_with(65            self.engine, self.REPOSITORY)66    def test_migrate_down_not_implemented(self):67        with mock.patch.object(self.migration_api,68                               'downgrade',69                               side_effect=NotImplementedError):70            self.assertFalse(self.migrate_down(self.engine, 42))71    def test_migrate_down_with_data(self):72        self._post_downgrade_043 = mock.MagicMock()73        self.migration_api.db_version.return_value = 4274        self.migrate_down(42, True)75        self._post_downgrade_043.assert_called_with(self.engine)76    @mock.patch.object(migrate.WalkVersionsMixin, 'migrate_up')77    @mock.patch.object(migrate.WalkVersionsMixin, 'migrate_down')78    def test_walk_versions_all_default(self, migrate_up, migrate_down):79        self.REPOSITORY.latest = 2080        self.migration_api.db_version.return_value = self.INIT_VERSION81        self.walk_versions()82        self.migration_api.version_control.assert_called_with(83            self.engine, self.REPOSITORY, self.INIT_VERSION)84        self.migration_api.db_version.assert_called_with(85            self.engine, self.REPOSITORY)86        versions = range(self.INIT_VERSION + 1, self.REPOSITORY.latest + 1)87        upgraded = [mock.call(v, with_data=True)88                    for v in versions]...

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