def _contribute_commands(self):
        self.commands['help'] = (self._cmd_help, 'Help!')
Verify a source has a default revision.
dataset/ETHPy150Open flask-admin/flask-admin/flask_admin/contrib/rediscli.py/RedisCli._contribute_commands--crossover with--dataset/ETHPy150Open jacebrowning/gitman/gitman/test/test_models_source.py/TestSource.test_init_defaults