def test_invalidUmask(self):
        config = twistd.ServerOptions()
        self.assertRaises(UsageError, config.parseOptions,
                          ['--umask', 'abcdef'])
If a value is given for the C{umask} option which cannot be parsed as
dataset/ETHPy150Open twisted/twisted/twisted/test/test_twistd.py/ServerOptionsTests.test_invalidUmask