def test_app_must_exist(self):
        deploy = self.mktemp()
        FilePath(deploy).touch()
        app = b"/path/to/non-existent-file.cfg"
        exception = self.assertRaises(UsageError, self.options.parseOptions,
                                      [CONTROL_HOST, deploy, app])
        self.assertEqual('No file exists at {app}'.format(app=app),
                         str(exception))
Convert a list of lists into newline-separated, pipe-delimited strings
dataset/ETHPy150Open ClusterHQ/flocker/flocker/cli/test/test_deploy_script.py/DeployOptionsTests.test_app_must_exist--crossover with--dataset/ETHPy150Open boakley/robotframework-workbench/rwb/editor/extensions/abstractfilter.py/AbstractFilter.convert_to_string