def create(self):
        """
        Create and return a new L{SSHCommandClientEndpoint} to be tested.
        Override this to implement creation in an interesting way the endpoint.
        """
        raise NotImplementedError(
            "%r did not implement create" % (self.__class__.__name__,))

        Create and return a new L{SSHCommandClientEndpoint} to be tested.
        Override this to implement creation in an interesting way the endpoint.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_endpoints.py