def test_usage_error_status(self):
        fake_sys_module = FakeSysModule(argv=[])
        script = BuildScript(sys_module=fake_sys_module)
        exception = self.assertRaises(
            SystemExit,
            script.main, top_level=FLOCKER_PATH)
        self.assertEqual(1, exception.code)
``BuildScript.main`` raises ``SystemExit`` if there are missing command
dataset/ETHPy150Open ClusterHQ/flocker/admin/test/test_packaging.py/BuildScriptTests.test_usage_error_status