How to use the fakeredis._server.NoResponse function in fakeredis

def _unsubscribe(self, channels, subscribers, mtype):
        if not channels:
            channels = []
            for (channel, subs) in subscribers.items():
                if self in subs:
                    channels.append(channel)
        for channel in channels:
            subs = subscribers.get(channel, set())
            if self in subs:
                subs.remove(self)
                if not subs:
                    del subscribers[channel]
                self._pubsub -= 1
            msg = [mtype, channel, self._pubsub]
            self.responses.put(msg)
        return NoResponse()

def _subscribe(self, channels, subscribers, mtype):
        for channel in channels:
            subs = subscribers[channel]
            if self not in subs:
                subs.add(self)
                self._pubsub += 1
            msg = [mtype, channel, self._pubsub]
            self.responses.put(msg)
        return NoResponse()

def valid_response_type(value, nested=False):
    if isinstance(value, NoResponse) and not nested:
        return True
    if value is not None and not isinstance(value, (bytes, SimpleString, redis.ResponseError,
                                                    int, long, list)):
        return False
    if isinstance(value, list):
        if any(not valid_response_type(item, True) for item in value):
            return False
    return True