test_policies.py 文件源码

def test_deprecated(self):
        import warnings

        warnings.resetwarnings()  # in case we've instantiated one before

        # set up warning filters to allow all, set up restore when this test is done
        filters_backup, warnings.filters = warnings.filters, []
        self.addCleanup(setattr, warnings, 'filters', filters_backup)

        with warnings.catch_warnings(record=True) as caught_warnings:
            WhiteListRoundRobinPolicy([])
            self.assertEqual(len(caught_warnings), 1)
            warning_message = caught_warnings[-1]
            self.assertEqual(warning_message.category, DeprecationWarning)
            self.assertIn('4.0', warning_message.message.args[0])