You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: consumer_groups.rs
    path of file: ./repos/iggy/server/src/streaming/topics
    
    the code of the file until where you have to start completion: use crate::streaming::topics::consumer_group::ConsumerGroup;
use crate::streaming::topics::topic::Topic;
use iggy::error::IggyError;
use 
    
    async fn should_be_joined_by_new_member() {
        let consumer_group_id = 1;
        let name = "test";
        let member_id = 1;
        let mut topic = get_topic();
        topic
            .create_consumer_group(consumer_group_id, name)
            .await
            .unwrap();
        let result = topic
            .join_consumer_group(&Identifier::numeric(consumer_group_id).unwrap(), member_id)
            .await;
        assert!(result.is_ok());
        let consumer_group = topic
            .get_consumer_group(&Identifier::numeric(consumer_group_id).unwrap())
            .unwrap()
            .read()
            .await;
        let members = consumer_group.get_members();
        assert_eq!(members.len(), 1);
    }