def test_deploy_must_exist(self):
        app = self.mktemp()
        FilePath(app).touch()
        deploy = b"/path/to/non-existent-file.cfg"
        exception = self.assertRaises(UsageError, self.options.parseOptions,
                                      [CONTROL_HOST, deploy, app])
        self.assertEqual('No file exists at {deploy}'.format(deploy=deploy),
                         str(exception))
A ``UsageError`` is raised if the ``deployment_config`` file does not
dataset/ETHPy150Open ClusterHQ/flocker/flocker/cli/test/test_deploy_script.py/DeployOptionsTests.test_deploy_must_exist