def test_label_command_no_label(self):
        args = ['label_command']
        out, err = self.run_manage(args)
        self.assertOutput(err, 'Enter at least one label')
User LabelCommands raise an error if no label is provided
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/tests/regressiontests/admin_scripts/tests.py/CommandTypes.test_label_command_no_label