def test_levelWithInvalidName(self):
        """
        You can't make up log level names.
        """
        bogus = "*bogus*"
        try:
            LogLevel.levelWithName(bogus)
        except InvalidLogLevelError as e:
            self.assertIs(e.level, bogus)
        else:
            self.fail("Expected InvalidLogLevelError.")

        You can't make up log level names.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/logger/test/test_levels.py