@gen_test
    def test_help_invalid_command(self):
        stdout, stderr = yield async_run_ctl('foo')
        self.assertEqual(stdout, '')
        err = stderr.splitlines()
        while err and err[0] in 'import':
            del err[0]
        self.assertEqual(err[0], 'usage: ' + USAGE)
        self.assertEqual(err[1],
                         'circusctl.py: error: unrecognized arguments: foo')
dataset/ETHPy150Open circus-tent/circus/circus/tests/test_circusctl.py/CommandlineTest.test_help_invalid_command/swapped operands of `in`